news.nationalgeographic.com - Sloppy male kissers may have a method behind their messiness.

Men in general seem to like wet kisses with more "tongue action," said anthropologist Helen Fisher of Rutgers University.

This could be because modern males are instinctually using kisses to pick up traces of estrogen in a woman's saliva and thus gauge her fertility.

Wet kisses could also be an unconscious attempt to transfer testosterone to the woman, which would stimulate her sexual interest, Fisher said Friday at a meeting of the American Association for the Advancement of Science in Chicago.

"Men see kissing early in a relationship directly as a step to copulation," she said.

Sloppy smooching could therefore be an "all-purpose mechanism" to get the reproductive juices flowing.
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