I feel like when a lady with huge boobs is entering the MPa world, the first thing she should learn is how to properly titty fuck.
Its not a tool that is often utilized in an 'at home setting', so men are often super excited to try this new treat.
I'm sure there are civy women who are happy to try it, but I feel like very few of them have mastered it in a way that a professional with a large client roster has.