When I first got together with my wife she insisted that neither of us share with each other of our past relationships or sexual experiences. I was fine with it because I always believed in the ignorance is bliss mantra for certain circumstances. After about a decade of marriage and a couple of kids she starts asking and stuff. I didn't really want to share but she told me about how she had a threesome while in college a couple of times. I did admit that I was a bit jealous. She also told me that she slept around a lot in college and that her count was like 50-60 she can't really remember. But then she asked about mine and that's when I told her about the escorts. That's when she got mad about me telling her about my past.
I mean... it's probably good to talk about these things before getting married, since it will inevitably lead to unresolved feelings later on. I wouldn't mind if, for instance, my partner was a slut while I was a sexless virgin before we got together, but I would at least want to know that about them. In my mind you're supposed to talk about your life experiences with your partner, and sex is falls under that umbrella. Idk, maybe I'm weird for thinking that.