Why guys cheat in the summer: during the warm-weather months, men are more likely to be unfaithful. Here's what to look out for.(LOVE AND LUST: The Hot Issue)

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We hate to interrupt all the fun you are having at barbecues and pool parties these days, but there's some surprising news you need to know about: Summer is cheat season the time of year when people are most likely to sneak around on their partners.

And though chicks do their fair share of cheating, guys are more prone to being summertime two-timers because they're more likely to stray in general, says New York City therapist Diana Kirschner, PhD, author of the forthcoming Love in 90 Days.

Of course, we're not saying that your man is definitely gonna step out on you by Labor Day. But it's a good idea to read the info below so you get a handle on why it may happen, plus the tip-offs that can tell you if more than his eyes have been wandering.

Reasons Men Two-Time During Summer

Remember when you were a kid and summer meant no school, freedom, and fun? Well, that attitude carries over into adulthood, leaving us with the sense that during these months, the usual rules don't apply "Some men take this to mean that it's okay to cheat once the hot weather rolls around," explains Daniel Kruger, PhD, evolutionary psychologist at the University of Michigan at Ann Arbor. "They think, Oh, it's just a summer fling, as if normal couple behavior is on hiatus."

That same outlook also makes people associate the summer with adventure. "Now is the time when you're more apt to try something new, and any novelty increases your body's production of dopamine, which triggers the release of testosterone--two chemicals associated with energy, elation, and sex," explains Helen Fisher, PhD, author of Why We Love. Translation: A guy may seek sexually charged situations and could give in if tempted.