Males, he argues, can be dangerous. They rape and kill, especially when one deposes another in a social group. But one sign that males may not be dangerous either to females or to their children is their willingness to play with them. So it is possible that females seek out mates who are playful, both for their own protection and for that of their offspring. Men, for their part, are not immune to the pleasures of playfulness in selecting a mate either.
Playfulness can be an indicator of youthfulness in women.
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