Think you’re a “True Sexpert”? Take the quiz to see how your favorite sex organ stacks up… (We’re talking about your BRAIN. Keep your mind out of the gutter!) What percentage of men reach orgasm every time during sex? 50%. 75%. 95%. What is the most common sexually transmitted disease in the world? Human papillomavirus (HPV). Gonorrhea. Syphilis. HIV. True or False: Women are more likely to climax when ‘on top'? True. False. True or False: The clitoris has twice as many nerve endings as the penis. True. False. True or False: Sperm can remain alive inside of a woman's body for more than four days. True. False. Is it possible for a woman to get pregnant during her period? Yes. No. If you wear two condoms, does it make sex safer? Yes, the extra condom provides extra protection. No, it doesn't matter. Definitely not... it actually increases the risk of breakage!. Can riding a bike negatively impact a man’s libido? Yes. No. Do men have a G-Spot? Yes. No. How long does the average male orgasm last? 2 seconds. 6 seconds. 15 seconds. 25 seconds. How long does the average female orgasm last? 3 seconds. 6 seconds. 23 seconds. 45 seconds. At about what age do men and women in the United States lose their virginity (on average)? 15. 17. 20. 25.