MN territorialism is wild, the sheer amount of automatic hackles that are raised at the spectre of aNoThEr wOmAn!!!
A disturbing number of people seem to believe that a man and a woman in the same space can only ever lead to shagging. And everyday activities like eating meals and eating crap TV are the height of romantic intimacy.
In my flatshare days I lived with a man for a couple of years. I was single, he was a friend of friends and became a friend too. As did his girlfriend. Obviously nothing ever happened even though we sometimes ate meals and watched films together.
One of my friends has had two different female lodgers since he bought his flat, totally platonic. The first had a boyfriend while he was single; he's now dating someone new, but his new flatmate is single. Food is eaten, TV is watched - in fact I went round to visit him last week and had dinner with both him and his flatmate (new girlfriend is out of town). It's a non-issue for everyone involved.
Another of my friends has lodger in her place but only for 5 days per week - a man in a LTR who lives in Liverpool but works in London and is saving up to marry and buy a house with his fiancee. Perfect scenario for her, she gets help with her mortgage but also her own space at the weekend. They didn't know each other beforehand but they get on and in that case it's far weirder to ignore each other and pretend you're strangers than to just eat dinner together if you're both around.
These aren't isolated examples, this is an entirely commonplace scenario. In the current rental/flatshare market, as long as the flat is habitable and the other people are sane and hygienic, you take what you can get - and that might not be much. Everyone I know has been through a houseshare period and it would be considered very unusual to stipulate by gender, and if a partner stipulated it on anyone's behalf it would be extremely controlling.
Sharing a flat, eating dinner and watching TV with someone doesn't usually lead to sex. A man and a woman put into the same space are not guaranteed to get it on (and usually won't tbh). Platonic is more common than romantic. If you don't trust your husband to be faithful that's a problem in the relationship, not the living arrangement.