I never, personally, felt the need to engage in casual sex with strangers. The idea of it has always creeped me out. I also felt that I couldn't meet the emotionally distant requirements to be a 'fuck-buddy'. If I couldn't keep the sex meaningless or not attach at least a string to it, then I'd just be putting myself into a place I didn't want to be and I'd end up feeling used. I wasn't willing to put myself or anyone else, through something I couldn't handle. It just seemed like it would create a mess, and since I am the only one with the problem, I'd have some lonely cleaning up to do.
I am not a 'free' person, I am a 'shy' person. Or modest, whichever word you'd like to put with this.I don't like being vulnerable. Being naked and having sex with someone leaves me, in what I consider to be, a vulnerable state. I have to love or care for someone enough to allow them full access to me in that regard. This is why my marriage is so reasonable. He's my Husband and my Best Friend. I've never had a better connection to someone. Did I save myself for this marriage? No. We were 'living in sin' , as-they-say, years before we even talked about marriage. If it hadn't been for him asking me one drunken evening at my Brother's house, we would never have gotten married; and I was alright with that idea too.
As for how other peoples sex life goes, it's really none of my business. I don't tend to ask.