Your move: Forget the elliptical, and ask her to hit the weights with you. A new University of Connecticut study found that resistance training increases free testosterone levels in women—a spike that also occurs when she’s head over heels. In a 2003 study, Italian researchers found that women who had recently fallen in love had testosterone levels twice that of non-smitten women, while a Canadian study found that women's testosterone also rises before intercourse. After your workout, reinforce her rising T with a sweaty makeout session: "Male saliva has 10 to 15 times more testosterone than the female's does," says Louann Brizendine, M.D., author of The Female Brain. "So prolonged French kissing may give a woman enough of a boost in testosterone to stimulate her interest chemically."
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