In time of war, when truth is so precious, it must be attended by a bodyguard of lies. Never Give In!
The answer comes from the realization that genes for behavior, as well as for malaria resistance and teeth, are subject to natural selection. Why Is Sex Fun?: The Evolution of Human Sexuality
Behavior evolves through natural selection, just as anatomy does. Hence if sex is enjoyable, natural selection must have been responsible for that outcome. Why Is Sex Fun?: The Evolution of Human Sexuality
Lawyers are shy of meddling with the Law on their own account: knowing it to be an edged tool of uncertain application, very expensive in the working, and rather remarkable for its properties of close shaving than for its always shaving the right person. Old Curiosity Shop
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