>>77174291>>77173521No, not really. It's to do with tissue damage and repetition. Size is (almost) immaterial; you can do a really big shit, maybe tear your anus a little bit getting it out and (aside from some risks of septicemia) you'll be fine a week later. Your butt is required to be fairly elastic (along with almost your entire gastrointestinal tract) because you're an animal that learns about the world by putting things in its mouth for the first couple of years.
It's not zero tolerance for that reason and nobody's saying you can't do it (though if you're hoping medical science is against homosexuality or anal sex in general, you're out of luck - medicine works on the principle of informed consent, whereby you're told the risks and make the decisions yourself, and of course accept the consequences yourself), but it's inadvisable without significant preparatory work and a strong regimen of exercise - do your kegels, people. And while you're at it, don't hold your breath while you're pushing a mess, it's cumulatively bad for you.
Every couple of months - with appropriate prep and levels of fitness - is probably not going to do much harm but as with anything, we're talking about playing the odds here - you can do it once and end up with rectal fissures despite trying to be responsible, you can do it a hundred times and never prolapse, but in both cases you'd be an outlier statistically. Yes, even if you know somebody else whose experience was nearly identical.
There's a long-standing grasp of this problem going right back to ancient Greece - writings of older men lamenting the fact that they're no longer tight abound - but that's not to say that there's a medical taboo against it either; besides informed consent being in play, you should also remember that homosexual (and indeed heterosexual) partners can express their affection physically in any number of other ways.
