QUOTE
“25 percent of women always climax during sex with a partner. The rest of us either hit — or miss — depending on the night, or never orgasm during intercourse at all. Compared to men — more than 90 percent of men get off 100 percent of the time. The clitoris has the indispensable function of promoting sexual excitement, which induces the female to have intercourse and become pregnant. But the actual incidence of the reflex of orgasm has never been tied to successful reproduction. Translation: Because women can and do get pregnant without climaxing, scientists can’t figure out why we orgasm at all.“
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Anatomy of an Orgasm, Women’s Health
This article is worth the read and basically says that even if orgasms are pointless in terms of sustaining the species, they still feel pretty damn good, and here is how they work… It’s totally fascinating.