Slapping butt during sex: hot or not?

I recently had sex with a guy for my first time a couple weeks ago (I'm 19 in college) and he really liked to slap my ass. At first I was a bit indifferent, but after a the third time I started getting kind of pissed off. I'm aware that other women, apparently a lot (according to Reddit, ask.com, and Cosmo) are into it. So I'm curious, is it the guy you're with or is it more of a you either like it or don't type thing?