Why does my boyfriend always act weird when I talk about sex?

Anonymous
So long story short, my boyfriend and I been together for almost 2 years. Our sex life is consistent we have sex when we see one another which is once a week. I’ve complained about our sex over time and it took its toll on him to the point where he said he’s always wondering if it’s good enough for me. We are young and still live with one another parents. Since the beginning he wasn’t one to be like “ oh yeah ima stick my blah in you” never been the type he did once and that was during the lockdown and it was through text. When we are on the phone I bring up sex sometimes like if he misses fucking me or something and he will say yeah and if I go into detail or ask of a more open question where it’s not yes or no he will be like “ the walls are thin I don’t want my mom to hear” that’s what he always says by the way. When I sleep over he freaks over his mom hearing us do anything. He didn’t even wanna have sex we did it once she left and he was still on edge. Tonight while we were on the phone I brought up something I wanted to try new (something he wanted to try awhile ago but I shut down) and he was like oh yeah I don't know maybe it’s either a yes or no and I said well I’m bringing it up asking how you feel. And he was like I don’t wanna talk about that rigit now babe. Then he texted me while we were on the phone and said “it’s super quiet (which it was, it’s late) and I don’t wanna have that convo about that right now” is this like normal for dudes? I mean he doesn’t like sexting or phone sex either. Loves my nudes has a gallery of it in his phone, very affectionate with me but seems to be like that when I bring up sexual things. Why is this?
Why does my boyfriend always act weird when I talk about sex?
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