Generally speaking, a man's purpose in life requires a woman. Without an ability to impart yourself through your children in order to shape society through them and the ancestors who imparted themselves on you, you're wholly lacking in purpose. Those able to devote themselves to God instead may find that purpose but many men lack the moral virtue capable of that journey which then leaves family as the next major purpose in life. Without that, most men are left with nothing. Sure, in theory you could create a business, become a politician or some other aspect to give your life meaning and an ability to contribute toward one's community. That's easier said than done and in a society where western women aren't worth living for, chances are the community itself isn't either because it's the community that made western women undesirable in the first place. That essentially leaves not much in the way of purpose for most men.