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By contrast, women may be hard-wired to choose their partners carefully, because they are the ones who can get pregnant and wind up taking care of the baby.They are likely to be more attuned to relationship quality because they want a partner who will stay around to help take care of the child.

Why are women's sex drives seemingly weaker and more vulnerable to influence?

Some have theorized it's related to the greater power of men in society, or differing sexual expectations of men when compared to women.

"Men are very rigid and specific about who they become aroused by, who they want to have sex with, who they fall in love with," says J. He is a Northwestern University sex researcher and co-author with Chivers on the study.

By contrast, women may be more open to same-sex relationships thanks to their less-directed sex drives, Bailey says.

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Men also say they want more sex partners in their lifetime, and are more interested in casual sex.

Men are more likely to seek sex even when it's frowned upon or even outlawed: What turns women on? Northwestern University researcher Meredith Chivers and colleagues showed erotic films to gay and straight men and women.

Laumann prefers an explanation more closely tied to the world of sociobiology.

Men have every incentive to have sex to pass along their genetic material, Laumann says.

"Men want sex more often than women at the start of a relationship, in the middle of it, and after many years of it," Baumeister concludes after reviewing several surveys of men and women.

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