... lays in biology. Trivers (1972) explains why society tolerates male promiscuity, but disapproves female promiscuity as following (Baumeister, 2001). Because of the unlimited sperm and very limited egg production, it makes sense from the evolutionary perspective that male tries to inseminate numerous females, while females should be careful when choosing a male to inseminate her precious egg. Also, female's investment is much larger than male's, because of the nine months pregnancy where she invests her body's energy and consequently she is highly selective when choosing a mate. Thus, to ensure that her offspring would be taken care of, she would favour a male who is ready and capable to supply resources (Buss, 1989 in Baumeister, 2001). Consequently, men should favour casual sex and variety of partners, while women should favour smaller numbers of partners and be less enthusiastic about casual sex. The main reason why men are highly judgemental on ...

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