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Two observations:

1. A male can mate with multiple females within a short timeframe, thereby maximizing his offspring. A female cannot do the same; a female can only spread her genes once every nine months. Thus, from an evolutionary perspective, it is more reasonable for a male to have multiple female lovers than vice versa.

2. Long-term relationships are kind of a hit-or-miss ordeal. A child only needs to be raised by both father and mother for a few years. After a certain point, the mother can fend for herself and her child just fine without the father. Thus, there really is no point in continued romantic involvement between the father and the mother unless more offspring are produced.

-wartrol