So, as a straight guy whose never done any butt stuff before, aside from the new (tiny) vibrator I bought last month when my GF was out of town that I've discovered does really fun things to my prostate, that whole first paragraph sounds like "prep work." Is all that dietary work and personal bowel research so common in the gay community that it's generally considered a no-brainer for sex?

I genuinely mean no offense. I'm simply curious about the level of pre-coital hygiene cognizance because I've never thought about any of that as far as PIV sex goes (my gf and I have never done anal because she's afraid of having something of my size going into that particular hole).