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The majority of them have. They have foregone serious long term relationships with women.
I see many single men in their 20s-30s-40s.
The problem is that they haven't given up casual sex, so women can still have children without husbands. Men have in effect taken themselves out of the family unit and the ability to influence future generations, but most are too busy reading the latest issue of Playboy to see what they have done to themselves.
Therein lies much of the bitterness I see in modern relationships...each is wary of the other (the fruit of thinking of the thing as a battle, though to a point the metaphor makes sense), and neither expects the thing to last, so they avoid giving up a part of themselves which will most likely be lost when the short time the relationship has the easy shine of newness about it is over. But it is not good for man to be alone, and any dolt can see that women have to maul themselves to give up men and the family that a man provides.
The political and societal turmoil are a result of this, I think. The character the family used to provide is no longer a factor in many young men's lives, leading them to a life of crime, licentiousness, and dysfunction; the anchor and shelter a family used to provide is no longer a factor in many young women's lives, and they go out into the world thinking of love (whatever notion they have of it) and sex as instruments to attain their will.
It seems a fixture in young women that can only be rooted out by considerable effort and/or abuse that they will one day be rescued (from loneliness?) by a white knight and live a life of true love and happiness. When they are finally disillusioned of this (which is to say, when they no longer believe this possible--the thing may be an illusion, but if it is so it is a blessed one), what is left but to give themselves away, or to barter themselves away? It is an intense pleasure, but like all of them it fades with constant use...that, coupled with the decided lack of white knights these days contributes in great part to the increase in lesbianism and bisexuality among women, IMO, and to the bitterness I see among some of them. The feminization you mention (which no doubt has some part in the increase among male homosexuality) makes men unfit for women, and the equality being pounded into women makes them unfit for men...we have far too few white knights, and fewer damsels. It is a perlious situation.
That's just quitting.