I actually fucked a "straight" friend once. His GF was out of town, he and I went drinking and decided to come back to my place to have a few more. After a few, we ended up in my hot tub; After a few more, the suits came off. He crashed here, since I only have one bedroom - he slept in bed with me. I awoke to him spooning with me in the early morning hours, hands wandered and he ended up laying face down taking an ass pounding. Didn't want sucked, kissed or jerked off - just fucked.
We're actually still good friends - it's never happened again and we haven't spoke about it except for him to ask me to not tell his GF he stayed over.
True story, no BS. I thought it was kinda odd that a 'straight' guy would enjoy this, but apparently not.