Is monogamy an unrealistic expectation?
Male ejaculate contains not only sperm designed to fertilize the female, but also a kind of sperm made specifically to kill other sperm. Mother Nature, it would seem, intended for each woman to copulate with several men, with only the "best" sperm making it to the ovum. Men who know, or think, another male has serviced the female will have harder, longer, more copious orgasms that they report as being especially satisfying. For human males then, a three or more some serves as an especially powerful aphrodisiac...
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