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The first kiss can make or break a couple’s relationship, suggests a new study.

A kiss may contain potentially important information about your kissing partner, says George Gallup at the State University of New York, Albany, US.

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Some views verged on the predictable: women, for example, placed more emotional importance on a kiss, valuing kisses during and after sex, and throughout a relationship.

The men tended to see kissing as a means to an end – sex – and placed less importance on kissing as a relationship progresses. Just over half the men said they would have sex with someone without kissing, compared with 15% of women. And more men than women said that a good kiss was one with tongue contact, where the partner made moaning noises.

But Gallup says the first kiss a couple share could make or break the relationship. In a separate survey within the study, 59% of men and 66% of women reported on occasion finding themselves attracted to someone, only to lose interest after kissing them for the first time.

“The complicated exchange of information that occurs during a kiss may inform evolved, unconscious mechanisms about instances of possible genetic incompatibility,” Gallup says.