Jude Law cheated on Sienna Miller, Peter Cook did it to Christie Brinkley, Kate Hudson reportedly did it to Chris Robinson and rumors have been flying recently about whether New York Yankees star Alex Rodriguez is doing it to his wife, Cynthia.

But infidelity isn’t just confined to rich and famous, and experts say it has a lot to do with … temperature. Flings, they say, are a summer thing.

“Warmer weather has a huge impact on our hormones,” says Patrick Wanis, a relationship expert for Playboy Radio and Cosmopolitan magazine. “Summer is the most sensual and erotic time of the year. We show more skin, we’re emotionally more open and there are many more social and vacation opportunities to be led astray.”