Trying to hook up with a friend.

I’ve had a crush on what I thought was my straight friend for a while now. He’s one of the main people I hang out with in school, and we have fun together. His whole childhood he grew up in the more ‘prejudiced’ part of the city, where everyone explicitly disliked non-heterosexuals. Recently, at a party 3 weeks ago he confessed (while drunk) that he finds boys physically attractive, and that he would never have anything against hooking up with them sometime. He told me he’d never told anyone before, since his only friend never takes about interests in anything sexually. He also emphasized that he couldn’t have a romantic relationship with a boy however, and that it’s only the physical aspect he liked, not the romantic part. The problem is that I do like like him. I’m going to a party with him tomorrow, and I am really tempted to hook up with him (and maybe escalate things further if the possibility comes), but I am unsure if I should, and how I would approach the situation. At the start of the school year he was very insistent that he only liked girls, but that has now revealed itself to not be the case. Could it be that he still potentially could like men in more than just the physical aspect? Like something he repressed because of his childhood? How would you suggest I start hooking up with him? I am really unsure what to do, but I know there’s at least a somewhat chance for this to happen now. Any other thoughts?