Gents everywhere often face the difficult task of training a pet vixen to do bbj well, that is without tooth contact, with good visuals, enthusiasm, and an appreciation of the dietary benefits. This surely is a daunting task for newbies.
There is a training video put out by one Zoe Zane, with tips and illustrations. Click and see if it works.
http://www.zoezane.com/Images/ZZ_2.gif

I know all the ladies at OA in LA have seen that video.