Masturbation as a reaction against survivalism.
We do not want to reproduce our bodies we replicate into others our beliefs and knowledge about the depths of the world.
What a man has to do is only to fight to survive. When survival comes easy, what the man can do? He finds himself dazed by the situation. He has nothing to do. All his life is instinctual oriented to survival so his mind will go there always but in other ways.
All that motivates a man and a woman, is survival (existential) nothing else.
A woman's survival, maybe, has something to do with making babies. So it might be finding a mate good to produce babies and care for them.
So she might be into - survival of the other and caring to socialize to belong to a group where she can find a good mate. And after she has children she survives with all her being through her children.
Those that do not feel like this are defected, those people are Us. Defected people with no instinct of survival of Self, but survival of the Truth. That ambiguity and mysterious non-thing.