For the first 15 years of my career I spent 15 - 20 weeks out of the country. We did at least a trip a month, usually in pairs.
How sickeningly sexist and belittling of women to assume that any woman on a business trip is only there to shag a man. I sometimes encountered that attitude from men when I was abroad - (never from a colleague but one particular client comes to mind - bastard 
) - but I never saw that attitude from a woman.
I often spent evenings and weekends with male colleagues in lovely hotels, (and some grim ones); shared dinners - over which we talked tactics and prepped materials and documents. I NEVER ONCE EVER so much as flirted with a colleague. I regularly went ahead of time - (cost of flights, prep time, not wanting to arrive at a business meeting knackered, safety net in case plane delayed, time to acclimatise - and a host of other reasons).
Why would a bunch of other women jump to that conclusion.
(Once a colleague dropped out of a trip because his wife discovered he was going to be travelling with me, (a woman). She rang the boss(!! 
) and asked that a male colleague replace me, "for obvious reasons)!. Thank goodness the company treated her with the contempt she deserved. The guy, who was bloody good at what he did, missed that trip and mainly did trips alone after that but the marriage didn't last - how could it?)
People do cheat on their partners. Women cheat with gym instructors and tennis coaches if you want to be clicheed about it. The assumption that a woman would cheat on your husband just because she is a woman is insulting and stupid.
(If you DH is a cheat then he is a cheat - that is between you and him)