Doesn't even have to be me I just get aroused hearing about it lol — and I hear about it quite often
I can tell you about my experiences if it gets you horny. I'll always remember the straight married guy on a hookup site, who said he'd never had anal before. He invited me to his place when his wife was at work, and soon I was naked and on his marital bed - me on my back on the edge of the bed, him standing.
That was a good position to be in, because I'll always remember his face. He seemed as though he couldn't quite believe what was happening and yet it was happening - his hard lubed wrapped cock slid deep into my ass, he held it deep for a moment and I squeezed. Then looked him in the eyes and said "now fuck me". And fuck me, he did. He absolutely pummeled my ass, like all that pent-up frustration and long years of wanting to fuck an ass, was being unleashed through his hard dick. He was merciless, and I was a hole to satisfy his lust.
When he built up to his orgasm, he got this wild crazy look in his eyes like a wild animal. He lifted my ass and rammed extra hard and deep, and unleashed, then relaxed.
In that moment, he did what a lot of straight/questioning guys do - he came to his senses and seemed to be embarrassed by what had just happened. I always try my best to put them at ease. I just smiled, eased him out of me and took care of the condom for him, and said wow and thanked him.
Then as I was sitting up (and of course, not sitting my lubed hole on the bed, I always remember my manners), he told me not to make a mess on his wife's bed cover, LOL. Not "the" bed cover, his wife's bed cover. It was funny to me, in that moment, having just fucked a guy, that he thought of his wife. I took care of the rubbish for him and said I'd take it with me (I always come prepared with a small bag for the purpose), which he thanked me for.
When I got home, there was a message on the website "that was fkn hot, mate". (Australian men almost always call each other "mate"). I answered yes, it was hot for me too, your cock is amazing and you felt great. I never could get him to hook up again. Maybe he got an attack of the guilts, or maybe his wife did find a speck of lube on that bed cover.