There's more to sex than you know. In fact, facts about sex, are almost as interesting as the act itself. Here are some 13 facts about coitus that you probably didn't know about.

1. Sex can work as a pain killer.

Have headaches? Sex will take that away.

2. One teaspoon of semen can consist of 250 million sperm.

That's a lot of sperm!

3. A man's orgasm lasts an average of 22 seconds.

22 seconds of heaven!

4. Semen can also be used as a face cream. It helps fight wrinkles and prevent acne.

But would you use it?

5. A man ejaculates at the average speed of 45 km/h.

That's pretty fast.

6. A woman's orgasm lasts an average of 18 seconds.

18 seconds of heaven. But what if they were multiple orgasms? If so..

7. Sex can improve your sleep cycle, ease stress and lower blood pressure.

Having trouble sleeping?

8. Your heart rate can be between 140 and 180 bpm during an orgasm.

It is quite a workout for your heart.

9. The average vagina is 3 to 4 inches long and can double in size when aroused.

Pay attention to it the next time round.

10. Ejaculation can relief nasal congestion.

Better than blowing your nose.

11. A man is estimated to produce 14 gallons of semen in his lifetime.

That's a lot.

12. Pornography is the cause of erectile dysfunction in men under 40.

So porn isn't that good after all.

13. You won't get fat eating semen. One teaspoon contains 5 to 25 calories.

Low calorie diet.