is just one mechanism nature has evolved to get us to want to do it. Other species use pheromones, or periods of "heat" regulated by hormones, or even the tides or the weather. Environmental cycles are used by many species to synchronize or coordinate sexual and reproductive activity. Sex can be a dangerous and messy business and nature has to find ways to get us to engage in it.
But we must also recognize sex isn't just about reproduction, in some species (particularly humans) it is used for bonding and social purposes, and even for commercial and political control.
Sex and gender plays an important role in evolution and natural selection, but how it manifests itself is capable of infinite variety. Remember Spock's "Amok Time"? And what about that old sci-fi flick "Mars Needs Women"?
Space/Science » in reply to Sex for pleasure
The joy of sex
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- Unidentified Anomalous Phenomena