Kate Godwin was a transsexual prostitute living in Midway City, after being bought for the night by a lonely Negative-Man, she found herself capable of causing any solid object she touched to turn into liquid if she so desired (all things considered there are worse things she could have gotten). Deciding to use her new powers to help people Kate joined the Doom Patrol as Coagula, but since being a superhero wouldn't pay for her SRS she elected to continue her work as a street walker when she wasn't saving the world.After X-23 aka. Laura Kinney escaped from the Weapon X facility and she was forced into life as a hooker by a pimp named Zebra Daddy, serving a slew of highly masochistic clients. After killing Zebra Daddy and finding her "father" Logan, Laura expressed a desire to continue working as a prostitute in order to face her demons. Initially trepidatious Professor X and her father agreed to her request provided she be placed at the X-Ranch, a mutant brothel legally owned by Warren Worthington III aka. Angel, so they would know she was safe.
Selina Kyle spent most of her adult life as a dominatrix in the east end of Gotham City, after witnessing the exploites of the Batman first hand she became inspired to make her own costume and become the ultimate cat burglar, Catwoman, after amassing enough money Selina moved herself and her ward Holly Robinson to the upper end of Gotham. She continues to work as a freelance escort for two reasons, first, it's nice to have some extra cash, second, catering to a new rich clientele really opens the doors for Catwoman.