It's the presence of others who are smarter, kinder, wiser, and different from you that enables you to evolve. Those are the people to surround yourself with at all times.
Sex is probably one of the last forms of human expression to enjoy such a direct connection with nature. It might be the primary site of conflict between nature and culture. If one assumes that nature (or instinct) is repressed in a highly civilised society, then I think the conceptual dyad nature-culture is best preserved there, in the realm of sex.