Locke, your wrong about the purpose of sex. The purpose of sex at this point in our evolution is to bring humans closer together and to help establish families. Its probably one of the reasons that civilization developed. To deny the social aspect of it and say it is simply for reproduction is stupid. If it was just for reproduction why the hell do people have sex even when they don't want kids?

Sex causes a very strong connection between people.

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"It is dangerous to be right on matters where the established authority is wrong."
-Voltaire