tears

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The scent of a woman's tears decreases sexual arousal in men, according to research from the Weizmann Institute of Science in Israel.
Rats

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A study at the University of Toronto has revealed that male rats raised with more sisters than brothers are less appealing to potential female mates.
Chocolate

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Based on the thorough scientific review of natural aphrodisiacs to date, conducted at the University of Guelph in Ontario, ginseng root boosts arousal and sexual satisfaction, and chocolate increases desire.
Cheating

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A recent study found that a man is more than twice as likely to stay with an unfaithful girlfriend if she cheats on him with a woman than with a man, whereas women are more likely to break up with a boyfriend over a homosexual affair than a heterosexual one.