Guilt, never. I usually avoid anything that advertises things I don't want to watch (fisting, scat, piss) which don't make me feel guilty, but disgusted.
Porn was my introduction to gayness--I saw 1950's posing strap mags when I was a preteen and realized, finally, that I was not alone in being fascinated by naked men. Wow, what a relief!!
I still love porn (in my seventies) and rate this forum as a primary source. Thank god for the link that led me to GH and other sites that give me free access since I can no longer justify paying premium prices.