I like to fuck them in their underwear.

I like to fuck a woman while she is wearing her underwear. I'll pull down her shear panties enough so she can spread her legs, or sometimes I'll take a razor blade and slice an opening so she can keep her panties on. I love to feel her panties rub against me while we are fucking. Especially when doing her doggy style. Yeah, I'm always having spring for a new pair of woman's undies (damn, they can get expensive. I go along with them to shop and most times get to pick the ones I like.) Is this type of fetish normal?