Back tattoos.
I posted this joke in r/funny but someone suggested that this was a more appropriate subreddit. Anyway, here’s my joke:
I was at the beach the other day and I saw a girl with a big iguana tattoo on her back, and I thought, “that’s really sexy.”
Well, it’s not so much that I find it attractive; it’s just a good indication that she’s prone to making poor decisions.
EDIT: I made this up, by the way. So feel free to tell my why it sucks.