Do you remember being in middle school and chuckling at any mention of sex or genitalia? Well, even into adulthood, some individuals have to stifle a laugh at some of the silly names we’ve given our private parts — dick, wang, cock, willy — just to get through a simple conversation. Everyone is very much aware of the vital role your penis plays in sex and reproduction, but there is so much you may not know about that most favorite organ.

If you’ve ever had an erection or enjoyed sexual intercourse, you are confident your penis is in good working order. But you may still have questions about your penis and how it all works. Can you make it bigger? Does size really matter? Can your penis ever get injured? For answers to all those questions and more that they don’t cover in sex-ed, keep reading for some fascinating facts you may not know about your penis.

You can enlarge your penis.

Penis size can be a big rigger and cause of anxiety for men. You want to feel confident in your manhood and impress your partners. Did you know, there are actually plenty of ways you can enhance your penis size. Some opt for enhancement surgery, injections, volume pills, vitamins, and diet changes. Others prefer kegel exercises they can practice to improve girth and length. Experts at puatraining.com have all the answers for ways you can try to grow your penis and impress your next partner with better, longer orgasms. While improving your penis size may seem appealing, remember that the average dick length is between five and six inches. So even though you may dream of having a pornstar sized penis, it may not be the most realistic thing, besides it matters more what kind of performer your little guy is in the bedroom.

While you were sleeping, your penis was hard at work.

If you have a penis, you’re aware that it sometimes has a mind of its own. Beyond just giving you a pants tent in front of your crush or just before your big presentation, your penis is hard at work when you’re not even aware of it. It is common for men to have three to five erections per night while you’re asleep. So sometimes, your penis stands at attention due to arousal, other times, it’s just a natural reaction.

Wanna bone? Your penis used to have one.

Chances are, you’re already aware that your penis becomes erect due to blood flow. This process is somewhat unique to humans, as animals have a bone in their penis that helps it stand erect. Scientists have discovered that humans used to have bones or spines within this vital organ, but evolution has eliminated the need for one.

You can break your penis.

Even without a bone, it is still possible to break your penis. When blood is flowing to your penis, a hard bend or trauma can snap one of the cylinders of blood and cause a fracture. This occurs mainly during sex, but can also be an unfortunate result of aggressive masturbation. So when you’re experimenting with how to cum more, just be sure you’re staying safe and protecting that important organ.

Some people are born with two.

When you love something, you want more of it, right? In the case of the male reproductive system, maybe not so much. It is possible, though rare for men to be born with two penises. This disorder is known as diphallus. And while it may seem like a perk—double the penis, double the fun?—it is actually more likely that neither organ will function properly and you’ll need extensive surgery to fix the problem.