The reason I ask is I've been with quite a few TV/TS and none of them came (In fact one in particular purposely stopped herself from cumming). Now, I never had the courage to actually ask them to cum on me but I always get the impression that they don't want to. Which in a way, makes sense because once they shoot their load it maybe harder to get an erection for their next client? And if that is the case, is there a certain time of the day you should visit a TV/TS in order to higher your chances and/or should you pay extra?

Anyways, I'm rambling here, just want to see if anyone could shed some light.

Thanks!