<human>: Can you condense the text into a few key points?

Just about every time we go out as a group, my boyfriend turns into a drunken mess. He'll either pick fights with random strangers, drink to the point of barfing or just generally act like a sloppy drunk. 

It almost always ends up with us going home and then him kind of forcing himself on me in a really drunk messy way. It's a huge turn off and I usually just say I'm tired and it ends up with me looking like a frigid bitch who won't put out. 

I don't want to be a huge buzz kill because I know that guys our age like to party, I just feel like he doesn't know where the line is because *every night out* ends like this. He often needs cues to remember most parts of the night the next day. I like having a good time as much as the next person, but isn't this excessive?

We are perfectly happy when we're together sober and we've been dating 6 months. I feel like suggesting that he just make nights out where he's gonna get completely shit faced a guys nights that I will happily sit out, but I'm worried that might offend him. It's only happened twice that I've rejected sex when he's really drunk and both times he was like "it's okay I understand" in a voice that clearly indicated otherwise.

Am I making a huge deal out of nothing? Sex with a completely drunk mess is just not something I'm interested in, and I feel like he doesn't completely grasp that. Is there a way to tell him this is no fun for me gently? I'm always honest with him when something upsets me and we are really good at talking out any problems we have, but I feel like this is a sensitive subject that makes me the bad guy I don't want to be. 

I'm all for him having fun; should I just sit these nights out? Part of me wishes it didn't have to come to that though, because I love him and by extension love spending time with him - just not the version of him that can barely form coherent sentences.
<bot>: Boyfriend gets really drunk every time we go out and it's a huge turn off that upset me - how do I (or should I) confront him?