Even if you don’t speak German you will find 5-minute video entertaining
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Donald S Crain, MD and Michael T Marshall, MD and John E Kehoe, MD:
“There appears to be a relationship between pornography use and sexual dysfunction in men who report a preference for masturbation to pornography rather than sexual intercourse.”
PD69-12 SURVEY OF SEXUAL FUNCTION AND PORNOGRAPHY | Journal of Urology
www.auajournals.org