Sex is a natural part of human life, yet it can be shrouded in mystery and misinformation. Test your knowledge with this sexual IQ quiz and learn a thing or two about human sexuality.

1. What is the average length of an erect penis?

a) 4 inches b) 6 inches c) 8 inches d) 10 inches.

Answer: b) 6 inches. According to studies, the average erect penis length is about 5.16 inches (13.1 cm) and the average girth is about 4.6 inches (11.7 cm).

2. Which of the following is NOT a contraceptive method?

a) Condoms b) Birth control pills c) Pulling out d) Prayer.

Answer: d) Prayer. While contraception can mean different things to different people, praying does not provide a physical barrier to prevent pregnancy.

3. What is the most common sexually transmitted infection (STI) in the United States?

a) Gonorrhea b) Herpes c) Chlamydia d) HPV.

Answer: c) Chlamydia. According to the Centers for Disease Control and Prevention (CDC), chlamydia is the most commonly reported STI in the United States, with a record of 1.8 million cases reported in 2018 alone.

4. How many calories can sex burn?

a) 50-100 calories b) 100-200 calories c) 200-300 calories d) 300-400 calories.

Answer: b) 100-200 calories. The exact number of calories burned during sex can vary depending on factors such as body size and intensity, but on average, sex can burn about 100-200 calories per half-hour.

5. Can you get pregnant during your period?

a) Yes b) No.

Answer: a) Yes. While the likelihood of getting pregnant during your period is lower, it is still possible. Sperm can live inside the body for several days, and ovulation can occur at different times for different people.

6. What is the main cause of erectile dysfunction?

a) Stress b) Poor circulation c) Aging d) All of the above.

Answer: d) All of the above. Erectile dysfunction can have multiple causes, including stress, poor circulation, and aging. Other factors such as medication, alcohol, and drug use may also contribute.

7. How many erogenous zones does the human body have?

a) 5 b) 10 c) 15 d) 20.

Answer: b) 10. Erogenous zones are sensitive areas of the body that can be stimulated to produce sexual arousal.

The 10 most common erogenous zones are the lips, ears, neck, breasts, nipples, inner thighs, clitoris, G-spot, prostate, and anus.

8. What is the average age for first sexual intercourse in the United States?

a) 15 b) 17 c) 19 d) 21.

Answer: b) 17. According to a survey conducted by the Guttmacher Institute, the median age for first sexual intercourse in the United States is 17 years old.

9. What percentage of women have never had an orgasm?

a) 10% b) 20% c) 30% d) 40%.

Answer: c) 30%. While the female orgasm can be more elusive than the male orgasm, 70% of women report having an orgasm during sexual activity.

10. What is the best way to communicate your sexual desires with a partner?

a) Drop hints b) Use nonverbal cues c) Be direct d) Keep it to yourself.

Answer: c) Be direct. Open communication is key to a healthy sexual relationship. Being clear and direct about your desires and boundaries can allow for a more fulfilling and enjoyable experience.