There is an art to pleasing a man orally, and it takes time to learn or rather acquire the ability. Sure a women can learn to contract her throat muscles, or take it deep. She can even learn to use her tongue or venture to different areas with it, but to truly be the best a woman can be at it, she has to love what she is doing. How to know a women will be really good in the art of giving head you need to make sure she loves doing it. If she lies about it you will know it is not something that can be faked there is a big difference I believe it comes with maturity and I speak from experience. If you want to expand on this subject with me in person contact me through my webpage or call me I would love to get deeper into exactly how you can tell. Hope to hear from you soon.  AMIE xoxoxo