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HABITAT men and women.
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Imagine a dolphin: it can go without water for a while, for example, to jump from it during the game, but his natural environment - water, where he finds strength. Similarly, the natural environment for women is the family, and for men - society. If a man spends too much time in the family, he becomes sick and miserable. And just getting sick and unhappy woman who has too much time to social activism.