As an early 30s breh creeping up on 35, thread is hitting home.
Worked extremely hard in my late 20s and early 30s to be making good money...so if I get even the hint that a woman was just having "too much" fun in her 20s and now wants to settle down with me, it's a huge turnoff. Too much being a higher body count than me.
I dated a woman who'll turn 33 next year - our chemistry was great, but I just could not shake that feeling (based on comments here and there) that her body count was higher than mine. I just couldn't. Did that for a few of months after starting out casual, it felt like a waste of time in retrospect, so now it's purely casual or going for broke on the marriage tip.
I also have an ex that I dated in my late 20s who I'd wife up in a heartbeat...she's just not discovered herself as a sexual person or comfortable with it. Prettiest girl I've ever dated but she's just blocked on that front. Hardest breakup I've had and low key sent me into a mini-depression after doing it.
But I keep pushing.