I took it as the time of life for "reckless" sex is when you're younger and a nobody and don't really have anything to lose as a result. But the fact remains that THE major motivator for many(not most, but a significant fraction) men, whether conscious or not, is sex. If they didn't think doing certain things would lead to increased opportunity to get laid, they simply wouldn't do it. Let's be real, in most fields, climbing the ladder SUCKS. I'm pretty sure I would be just as happy flipping burgers once my basic needs were met as office donkeying and churning out TPS reports.