Apartments have a busy sex atmosphere. I used single women. The married can be dangerous.
I used to cheat with neighbor's in my apartment complex. They never knew that it was my husband's idea though.
Before I got married to my husband, when we first moved in together, he made it very clear that he didn't want me to wear any clothes at home. He wanted me to be a home nudist. I asked what if someone comes over? He said to invite them in. Talk to them, screw them or don't answer the door. He said he didn't care what I did when company came over but I wasn't to cover up or put on any clothes. He wanted to always come home to me naked and randy for him.
At first I'd only strip down just before he got home. Then he started sending men he knew to show up to visit me. If he found out that I wasn't naked the whole visit he'd throw a fit when he got home. Reluctantly, I started complying. Nothing happened, sexually with them. After a while one of our neighbors showed up. I strongly suspected my husband sent him so I didn't cover up. It wasn't until that evening that I realized my husband hadn't sent him.
The next time he came over he propositioned me. I was tired of all of this nude forplay without sex so I agreed. When my husband came home I told him. He got excited and wanted me to keep it up. I messed around with him until we moved away. I telling you this because it is possible that her husband knew all along. Mine does.