Very interesting. Maybe you should get some feedback in the "Ask us anything" thread about this.
But then again, maybe it's just because they don't want to be infected by saliva.
I'm a big fan of DATY and look for it as much as possible. I made some ladies roll their eyes in the back of their head, squirt, moan, shoved my head in there and even on repeat date the first thing she did was sit on my face for the DATY. I did get a lady once that was a bit dry down there so I used a bit of saliva and as soon as she felt wetness she lifted my head and asked if I spitted in her vajayjay. I told her that it was like a guy getting a dry BJ....not good for us.
Here is a question for you all: Should DATY be accompanied with fingers?
I always keep my nails short and wash my hands when I enter a incall so that she should feel safe with my actions.
Some Sp's won't let you kiss(DFK) after you go downtown...why?
Here is a song to put you all in the mood for DATY.