Here is an entertaining PowerPoint about the basics of a blowjob. The link says it is a shared document, so I am only vouching for the information on this PowerPoint as of Saturday Feb. 25  at 2 pm.

I hope you enjoy it, but only if you are 18 years old or older because it does contain explicit images.

https://docs.google.com/file/d/0BwSVi7fy6gI9V2ZtOW5LcmlTMlNZN0pVN2JtMHFNdw/view?pli=1&sle=true