Me personally (F20), I can't remember my exact age, but I think i was around 15 maybe. I'd had seen the famous 2Girls1Cup years before lol, but i wouldn't get into it until much much later. I honestly don't remember how or when I actually got into watching it. As bazaar as it is you'd think I would remember. I think my love for anal/anything to do with an asshole, and watersports is what eased me into being ok with it. Which is why for me it's the act and not the actual shit itself. It's why i'm very picky about the type of videos i watch. I'd never understand why i like it tho. Sadly, i don't think this would be a fetish i could physically participate in.