Sloppy kisses have seductive chemicals

“Men like sloppier kisses with more open mouth and that suggests to me that they are unconsciously trying to transfer testosterone to trigger the sex drive in women,” said Helen Fisher, an anthropologist at Rutgers University in New Jersey.

Kissing can certainly open the door to sex, Fisher said. But it can also close it: a recent study found that the first kiss was the “kiss of death” for budding relationships.

“Should you drool more? You don't want to turn off your partner,” Fisher warned.

Kissing is a natural instinct that likely serves a number of evolutionary purposes, said Fisher, one of the leading experts in the biology of love and attraction. Men's preference for sloppy kisses with lots of tongue may help them over come their poor sense of smell and taste.

“What they might be doing is trying to pick up the estrogen cycle in a woman to figure out the degree of her fertility.”

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