Foreigner
Bluelighter
Not guy and not gay. But with so many things, I tried this once out, in a way "both ways". My experience was similar to this
No idea what expression my guy was wearing. I guess an anxious one because he was worried about "doing it right".
Then we tried the prostate thing, and that he did enjoy. For me it was a game of actually feeling where his prostate was. It's not that easy to find, at least not with one gloved finger.
So the result of that experiment was that he liked it, but only with one finger (two were too much) and I found more excitement in the situation itself than the actual act.
I've given guys prostate stimulation with a finger or two plenty of times, and I've experienced it too. Getting a BJ while your prostate is stimulated gives a mind-blowing orgasm. I have never been able to full get over the fact that anus = shit. It has gotten better with the years, but it still mildly grosses me out. The bottoms I've been with fortunately cleaned themselves out, but it's never that clean. I don't derive a lot of psychological pleasure from doing ass stuff to bottoms. I pretty much just want my dick in there and that's about it.
I guess sex just always has an underlying gross factor and the whole thing is weird if you take a step back from it, regardless of it's MSM, MSF or FSF.