My Sex Professor (http://mysexprofessor.com/how-to-have-sex/penis-size-and-good-sex/)
Penis Size and Good Sex from Debby Herbenick on Vimeo.
What’s the average penis size? And what size penis does it take for good sex? Thoughts on these questions and other genital fit related issues (plus intimacy and chemistry between two people) in the above video.
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Dr. Debby Herbenick is a sex researcher at Indiana University, sexual health educator at The Kinsey Institute, columnist, and author of five books about sex and love. Learn more about her work at www.sexualhealth.indiana.edu.