As a mostly straight guy.... I love anal play, but I don't do it much, as it is very addictive lol. I've got a dildo, a vibe, a prostate vibrator, and an aneros. I love to play with my ass, but the clean up and aftermath of the play the following day or so are the primary reasons why I don't do it on a regular basis (that and as I said above, its very addictive).
As for taking a man up the ass......it would take a very certain set of events for that to happen.
#1 be in a committed relationship with a woman (prefer to be married)
#2 bring in a close male friend into the bedroom for a MMF
#3 while I am fucking her, he would be fucking me
Now, if it were to all work out, and no complications or issues came up, this could become a regular type of thing.
so basically what I am saying, is that just straight up gay sex with a man is not going to happen.