Um. All three of your hits are based on "research" from the website described in one of your articles as:
Illicit Encounters is a website designed for married people to find a cheating partner. It's summer, it's vacation-time, so hey let's remind everyone that women like to cheat too!
I hit up my Google, too, and can't seem to find anything related to cheating/vacation/infidelity/travel-type stuff that doesn't originate from this study. What I did find was this, offered by Huffington Post:
Business travel often provides a cheating spouse the perfect cover for an extramarital affair. They are the most common settings for infidelity, according to “The Normal Bar” by Chrisanna Northrup, Pepper Schwartz and James Witte; 36 percent of men and 13 percent of women told the authors that they gave into temptation while on a business trip — even if they said they were happily married. An out-of-town trip can allow a cheating spouse the luxury of conducting his or her affair in a location that’s far from the sight of prying eyes.
Back to my friends, I suppose I feel confident because we tend to be sitting cross-legged on beds after dinner, happily chattering away. I would notice someone missing. I have traveled for work with other therapists (one coworker admitted to hooking up at a conference, but she's single and I don't travel with her), I've traveled with an attorney more than once, and when young moved in a pack with my gym buddies. One of our friends cheated on her fiancé at her bachelorette party (blew the hired driver - why??). I and my roommate at the time were stunned and dismayed. And I believe that's my lifetime experience of cheating and travel. And the second cheater wasn't even really traveling, but we were staying in a hotel in the city.
So sure, it happens, and the gap between men and women who cheat is shrinking rapidly, but still. It most often does NOT happen.
My fiancé travels for work (Chicago today) and I trust him implicitly. Naively? Perhaps. But I believe that non-cheaters don't cheat, and I peg him as a non-cheater.