Funny. I had the exact OPPOSITE experience this past week.
Hung out with a str8 buddy watching hoops, got pretty drunk as we usually do together, but not SO drunk we didn't know what was going on.
At one point, after a long bit of sex chat (especially about his not getting any lately), there was way too much tension, and I sorta surprised myself by straight out asking him "What do you want?"
He replied, "I want you to suck my dick."
We went back to my apartment and I did just that. He loved it. Asked if it would change our friendship. We agreed that it wouldn't. He slept on the couch, I went to my bed. Talked about it the next morning, and both sorta realized--don't know if this will sound strange to anyone here--that the night we had was more about intimacy and curiousity than "sex". I really wanted to feel closer to him; I wanted to get him off (and get off myself in the process!); he wanted to experience this thing that I talk about all the time (giving good deep head to another guy).
Of course we joked that if we really wanted to just get closer, we could have done any number of things, from miniature golf to merely jerking off together (which we've never done)...but it worked out the way it did. It was fun. Not sure if it will happen again--it would probably be his call, as he's the one who self-identifies as "straight" (which I think he really is). :smile: