I'd like to suggest you add the words sexually and porn to your AUP -

first thing I did was go to that page and ctr-f > "sex" - then "porn" - nothing was found.. so it created interest..

then I saw "are prohibited by the payment processing service; or " near the top and went oh my - many people are not going to get that this is the cop out -

I came back to the comment thread here and did the ctrl-f 'adult' - and found the answer.