... and I am not sure the reason, but link below is this board's history of "big load" from the search function.

Generally, the keys seem to be:
1) "fully functional" or "no hormones' in her ad, avoid references such as "very feminine".
2) First appointment of the day.

But the best way is always to ask her directly (before laying down the $), "Do you like cumming in my mouth?" and get her answer (listen carefully for enthusiasm, if any)  Rehearse asking it before the realtime call, if you need to.

THIS IS RISKY.  ALWAYS CHECK POSTS ON THIS BOARD FOR HEALTH ISSUES ON ANY PROVIDERS YOU ARE CONSIDERING.