NTA.

"People who disrespect relationships don't get to be around places meant to respect them. My house included. If you want someone who makes money off of being a knowing homewrecker, please invite her over. But I don't need that in my house."

She isn't doing sex work out of need, she's doing it because she gets off on fucking married men, which is pathetic. Doing something that pathetic and then bragging about it has consequences. This is one of them.

Make sure to ask anyone who tries to call you an AH how they would feel if they knew your sister was sleeping with their partner and bragging about it, and if they want their kids doing the same things.

This isn't a sex work thing. This is her pushing a gross kink on you. Please don't let anyone bully you into believing otherwise. If this was only work, she wouldn't revel in making people uncomfortable. Ignoring your consent isn't okay.