I’ve already answered this question (in detail) twice. So be sure to check the Sex Advice tag where everything is listed or the Sex Advice tags page where all the posts are categorized by subject. For this particular question, you would be able to find the answer you’re looking for under the tags Oral or “How To”.
This is really just a reminder to everyone that if I’ve already answered a question, I won’t reply because you should have already been able to find it by looking through the neatly organized tags! 🙂