I know a lot of sex workers that have children, some decide to be honest with their kids when they’re old enough to understand. Some decide it is none of their business.
You also have to realize that some of us have another job or occupation. We might not even need to talk about sex work.
I knew of a girl back in high school that seemed to have it all. Her mom was always picking her up in the latest car. She lived in a big house. She didn’t have a job according to the girl. Her mom just married an old rich man and he bought them everything they wanted. What’s different?
When I was younger I used to babysit for a woman, she was living alone with her child. Sometimes she was coming back home with a man and one day, because I was young and didn’t know better, I asked her if that was her husband. She said no, she said they just hang out from time to time and that he helps her with bills. Did I care? No. Did my parents care when I told them? No.
I think you might have some issues with that because that makes you uncomfortable.
TLDR: that’s a you problem