I'm not really turned on by body modificationsAny piercings beyond the ears and nose (on women) and more than a couple (small) tattoos off her lower back/abdomen/hips is usually a turnoff for me..
I don't have any body-type fetishes, as long as you're fit then you're fine for me the way you were born. (I wish more people thought like this.)
The only true fetish I have is incredibly odd and might actually gross some people outBut I think I would love to play with belly buttons (obviously never having done so but am turned on when I see it in porn). Especially if it's an outtie, then teasing them with nibbling on it like you would on a nipple turns me on. But I can see how it might not work out with most girls, lol.
Belly buttons fetishes are not so unusual-- I once had a boyfriend who was into this, and would play with mine, poke it with his little dick, etc. I have a small hernia above my belly button, which sometimes shows a little bump (just fat), according to how much weight I'm carrying at the moment. I had a friend (due to distance, I see him only rarely) who happens to be a doctor, and loved to play with my belly button and the little hernia bump. He would tell me how he'd love to do the corrective surgery, while lying beside me...