Blame it on the sun. According to new research from British “married dating site” IlicitEncounters, over a third of (already cheating) spouses can’t keep it in their pants while on vacation solo or with friends. In fact, six percent of the sneaky devils strayed while on holiday with their spouse. The real news, however, is that married women vacationing with friends are more likely to break their vows than men. “Sunshine is a real aphrodisiac.” says Sara Hartley, representative at IllicitEncounters.com. “We have always seen an increase in activity on the site during the summer months.”