Sexual Relationships
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Is my boyfriend cheating on me with my sister? If so, how could I catch them?

My boyfriend of about a year always gets nervous around my sister. I noticed he's been talking about her a lot. He asks a lot of questions about her. When we talk about her, he always has something bad to say about her, but he still talks a lot about her.. He comes over to my house all the time. Mostly to play his video games and lock himself away in my room. However, my sister comes over and walks around in her sports bra and panties (sometimes even naked because she takes baths and just walks around like that). It's frustrating. Long story short, our schedules are all jacked up. He works morning and day shifts, and I usually work closing shifts. When I leave for work, he doesn't leave. Sometimes he is home alone with my sister. He always says he doesn't do anything and doesn't even leave my room... but I'm starting to feel like something is going on... When I got home from work, of course my sister had already left. (It seems she only comes over when I'm gone at work and my boyfriend is there... ) Well when I got home, I found a pair of my underwear in the guest bedroom that she stays in (I guess she's been wearing them) and also a towel with cum stains on it. I' m wondering how that could even be possible... and I'm also grossed out she's wearing my underwear. They honestly looked disgusting... I was wondering, if this is actually going on. HOW could I find out for sure if they're really doing anything? I'm tired of feeling like this.

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Most Helpful Girls

  • Flip cameras are cheap, small, easy to hide, and have a long battery life. Set them up around the house and hide them. If they're hooking up you'll know after one night.
    OR play a mind game. I assume your sister and you are close. Confide in her saying that you suspect he's having an affair and exaggerate on how it's been affecting you. This would be enough to make at least my sister snap and come clean.
    OR maybe go home sick from work one night or say you have to work one night when you really don't. Leave the door slightly open or unlocked (WD-40 on the hinges will help), park your car out of sight in the same direction you take to work, walk back to the house and sneak in. If nothing is happening maybe hide somewhere for a bit. This obviously won't work if you have a dog.
    Either way I hope you find an answer!

    • Better yet. Go crying to your sister that you just found out that your boyfriend is fucking a girl at work that just found out she has AIDS, and you're SO SCARED...

    • Oh my god that's genius!!! HAHAHA

    • Thank you. Thank you. (BOWS). I'd like to thank all the sociopaths out there who have made me what I am today. A special shout-out to Ted Bundy and of course to my greatest inspiration, and our President, Trump.

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  • I think they are but even if they are, your sister is disrespectful as fuck walking around half naked with your boyfriend in the house. I do that in my house but when my sister and her husband come to visit and stay a few nights, I definitely do NOT do that. Not because he cheats or he likes me or anything but because it's just a sign of respect.

    • She doesn't respect anyone in the house hold.

    • So how long are you going to let it continue? Maybe they will leave together. Or he'll cry and say it will stop now or some other lies to try and hang on to everything.

    • I took the advice about the hidden camera. I'm hoping to find results ASAP.

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  • Have you spoken to or asked your sister about this? Asked what he does when you aren't there? From the evidence you've provided, I can only guess your boyfriend is jerking off in that room to her panties (sick but not cheating)

    • They were my panties... that she was wearing.

    • Doesn't really matter who's panties they were. Have you spoken to your sister?

    • Yeah, it really matters because it's sick and disgusting to wear someone else's underwear. And secondly; no I haven't spoken to her about it. I feel a straight up approach would not work in this case

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Most Helpful Guys

  • Tbh, in my case , my gut instinct is pretty strong, so fir you i would say the same thing, if you have a feelings its happening, then it probably is.
    I would say , set up hidden cams in the rooms you think its happening when they both aren't there. I think its pretty easy, if you ask around or look online for hidden cams, just make sure they dont know about it.
    Or you can hire a private investigator, but that may be too expensive.
    by the way, your sister is a bitch for doing that. I understand if you still love her, and i'd too , but she's still a bitch. As for your boyfriend, dont let him have any, till you resolve this issue. I wouldn't give him the pleasure of fucking two women in the family. Jeez, he must think he is the shit. The balls on that idiot...

    • Yeah, he's definitely starting to wonder what's up because we normally have sex like 3 times a week and I have been refraining from sex for about 2 weeks now.

    • Also, about the whole gut thing.. I really wish I could trust my gut but I'm also paranoid because of past experiences so it could just be paranoia.. for real

    • Lol he may catch onto it. And regardless wether past experiences were good or bad, was your instinct right back then? If it was, then by all means, trust your gut. I have had bad exoeriences too, but i trust myself. Its upto you to decide that tough

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  • The hidden cam that other people have suggested is a good idea. Another possibility is to tell your boyfriend that your sister told you, about 2 weeks ago, that she has genital herpes and you do not want to have sex with him again until he gets tested. If anything is happening between the two of them (which I strongly suspect,) that should make everything blow up.

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What Girls & Guys Said

15 35

  • It sounds like they might be doing it. You could possibly set up a few cameras throughout the house to catch them in the act. Just make sure to delete the content afterward if you do and please don't use it to blackmail them. However, hopefully you don't catch anything in which case you won't have to do anything with the videos.

  • You could tell your sister not to be in the house when you aren't there

    • Or not leave boyfriend with naked sister. Too late this time. Sister already got him

  • Set up a hidden camera - that's the only way to know for sure. IF they are messing around neither of them will ever admit it.

  • doesn't really answer your question specifically but couldn't you you just ask him to leave your house when you aren't there?

  • Find a time on your schedule when he and your sister are in your home and you are not working. Tell them that you received an emergency call from work and you have to leave for a couple of hours. Leave the house, but don't actually go too far. Wait like 15 minutes and quietly sneak into your home. Listen. If you can't hear anything, quietly walk towards your room or the guest room. You should be able to hear something by then. BAM! "I caught you", and dump him.

  • If she really valued you as a sister she wouldn't do that shit. If i was the one i would bitch slap the life out of her. Cut her the fuck off and kick your boyfriend to the curb. If she can do that to your boyfriend what's to say she won't steal your husband. what a whore.

  • he probably has 'the hots' for your sister, but I doubt they are having sex.

    • Thank I appreciate the comment

  • A man that I work with is fooling around with his sister in law. She works there to. I just can't believe she would do that to her sister. Good luck

    • I know.. you can see it happening more and more as time goes by. It's almost a normal thing to cheat on your significant other.. I seriously think it should be considered abuse and people should have more consequences because that can seriously fuck someone up mentally.

    • And why don't you tell her? Seriously. I would give anything to have someone tell me the truth

    • For one thing... it is none of my business. And another she might already know. I dont see how she doesn't know.

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  • Break up with him now and save yourself the drama.

  • Look on eBay for some hidden cameras, you can get some quite cheap I think. Set them up in the rooms you believe they'd be hanging around in whilst you're not there… and then if you get evidence they're banging eachother use the footage however you want!!

    I wouldn't let them get away with it easily

  • IF you suspect this then it's probably time to walk away. Clearly it's not working. There's a lack of trust and that's just the start of the problems.

  • Either check texts or put up some cameras or microphones because it's gonna be pretty hard to bust them otherwise. and if you actually check any of this hold your heart and expect the worst.

  • set a trap...
    Plant your sister's dirty panties near him lol... see what he does hahah

  • If your sister would do that to you, you should never trust her or think of her as anything but an enemy.

    My God.

  • I don't think catching them in the act will be good for anybody... just ask both of them and try and force it out

  • Do you have an extra Android phone?

    • No, he does though.

    • Well, almost any Android phone can be turned into a spy camera by downloading a $10 app.

    • Any Android is a sound recorder for free.

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  • Don't ignore your instinct on this. Also she left you a signal, the underwear. You say they were disgusting. Did she mess them as a woman does when she's sexually excited.
    You could get a listening device, one like a flash stick is easily left around, and you plug it into your comp and have a listen to what was going on.

    • Yeah they were my underwear that she was wearing and yes there are very visible signs of sexual arousment. Plus the towel with jizz on it

    • You need to be more sure though. Get a listening device. Good ones are not that expensive. But you have to time when you plant them. She could have masturbated in your underwear and left that towel just to cause trouble. So you need to find out for sure. I had similar trouble at one time. A listening device gave me the proof i needed.

    • Okay thank you

  • Take a day off of work, leave for work, leave your car somewhere they won't see it, walk home when she should be there, come in unannounced.

  • Well... he sounds like a loser anyway...

  • Stupid troll. Get a life.

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