Boyfriend had sex with my sister?

[Anonymous]

We have been dating for about 5 months now. He came over to my parents' house for dinner last night to meet my family. After he came in and met my parents and my sister, he pulled me aside and told me. He said they went on a few dates and it didn't work out, but he had no idea she was my sister. He said that they'd had sex but only twice.

We had dinner and it was a little awkward but he was meeting my family for the first time so I think that's normal. My sister went out with friends, so she didn't stay for dinner (thank god). I didn't talk to her about it because I didn't know what to say. I don't really know how to feel. I really like him and he told me straight up so it's not like he's trying to hide it from me. He stayed at his place, and I at mine last night, so we haven't really talked about it either. But it will feel so weird to kiss him and have sex with him now. Will this feeling go away? Does this have to be a big deal?

Does anyone have any experience with this. Maybe not a sibling but a best friend. Advice is appreciated.

[DaGenius]

Well if he told you he must be serious about you. It May all blow over. But it shouldn't be a big deal. It's before y'all dated. But if your sister disagrees with you dating. It might be wise to hear her reason why.

[Theguyoverthere]

I don't think you're gonna be able to look at him the same again after such an incident. I think you should talk it over with your sister though for sure and do your best to keep the family in tact.

[LostWolf]

I have no experience with this but I don't think you should think about ending the relationship or anything serious like that solely because he previously had sex with your sister. :$

[ApostleCat]

Kill your sister its the only way to continue living :3

[truthbeknown]

I think it will pass in time.