Nah, it's by choice for many of us. I have no problem getting sex or charming women, and throughout my 20s had a bunch of fun with many women. I just don't care to do it anymore. I would rather spend my time learning and building than socializing, stressing, and dressing. Mostly I put this down to getting older, but a big part is just coming to terms with myself and how that differs from societal expectations. I've become comfortable in my own skin, so no longer seek validation of my manhood through sex and friends and money.