Eliminate all skin to skin contact. Bring a pen and paper and we'll just draw pictures of things we think would be hot, or perhaps use dirty hand gestures, or better yet, use carrier pigeons to exchange messages. Yeah, I know that's makin ya'll horny. That's called Tea-Party sex.

...and this is one of them. It's not that a CBJ would be my first choice but if I can't leave a session with a sexy lady with her pussy juices still steaming on my mustachioed face, then I guess life is no longer worth living.  

Theoretically, it is possible to transmit any STD via DATY. In practice, though, the only STDs that are transmitted thru DATY are Hepatitis B and Herpes and warts (although warts are not technically an STD; all warts, no matter where they are on your body, are caused by the human papilloma virus, although there are different varieties); and even those are rare. STDs are almost unknown in the lesbian community for this reason. The transmissions we do know of involve drinking menstrual blood. If you don't do this, your chances of contracting an STD thru performing DATY are very low.