Quite a few times, business trips were a good opportunity to get away from my ex and have some fun. It seems trips like this are generally seen as opportunities to play away!
I slept with co-workers on a few occasions, mainly casual sex but for a while I was having an affair with one and she frequently came away with me. I would pick up women in pubs and take them back to my hotel, sometimes just for a quick fuck and sometimes for an all-nighter. My most unusual pickup was a woman I saw on a bridge looking at the scenery; I asked if she'd like a drink and she ended up spending the night in my hotel room. She was on business too, but had intended to go home that night. She phoned her teenage daughter from my room to tell her she wouldn't be home that night as she'd met a man and her daughter gave her hell! The next morning her legs were covered in 'fuck bruises' and she was very embarrassed - a few days afterwards, she was taking her daughter to Spain for a weeks holiday.
Then you go home and your wife says "did you have a good trip?" and you say "yes" but what you really mean is "yes, I was fucking a new woman all last night, bareback, and she was a damn sight sexier than you ever are!"