She (23f) sucked when being 15 years old a 30 year old male - this made me disgusted when I heard it but she doesn't really regret it.

N-count is 10 (including me). One relationship of 3 years, she broke up when 19 years old. The rest are one night stands. FC on second date. She slaps me sometimes, I slapped her back harder but it turned her on .... (while I get extremely turned off by this behavior)

I am aware that she could have lied, let's just assume she didn't at anything here, at how much red flags am I looking here?