They say don't judge a book by its cover and you shouldn't judge a man's "true" size by the size of his flaccid penis. A man's flaccid penis for one thing can change size depending on various environmental factors, such as the temperature. There also is little relationship in general between the un-aroused size and the erect size of a man’s penis when compared one man to the next. Some will grow up to 100% in size (colloquially referred to as growers) while others increase will be as little as 30% (show-ers). So you have to open the gift to see what you really got!

Have you ever noticed the ancient Greek statues, the ones carved from white marble of naked men of muscular build and modest endowment? Or old painted art for that matter. In ancient times, big penises were considered to be grotesque and animalistic while a smaller package was more desirable. It makes you wonder, is even penis size a matter of fashion?

If you have noticed white spots covering your partner’s shaft and even his scrotum and been a bit concerned, you can now rest easy. Named Fordyce Spots, they are genetically inherited, are not uncommon and although not beautifying, they are harmless and non-contagious.

Have a look the next time you are getting familiar with your partner. Just sit down and have a stare at his balls, they really are as interesting as he thinks they are! The scrotum is not just skin, internally it is actually layered with muscles that, like the heart, do what they do without being told what to do. So even if he sits perfectly still, you will see his scrotum swirling around like a weather pattern on fast-forward. The reason: the sperm in the testicles needs to be kept at a specific temperature so the scrotum tightens or relaxes to bring the testes closer or further away from the warmth of the body. Cool!

OK, you already knew there were no bones in his penis but still, how does it get so hard? When he gets an erection, blood starts to fill the penis which accounts for the growth in size. The stiffness and hardness is because the blood is actually filling three spongy tubes, two on the side and one on top, that just like one of those clown balloons, tends to stick out straight and hard when inflated.

Now, you might disagree with me heartily on this one but the "cheese" that you can find under the foreskin of an extremely unclean male is actually healthy on an uncircumcised penis. Technically called smegma, it has anti-bacterial properties that help stop infection. Now having said that, even when there isn't enough to see, it can smell and taste bad so guys, for the woman who is going down on you, keep your junk clean!

Guys get boners during the night when they enter the REM (rapid eye movement) stage of sleep - when they are dreaming. Why? One of the main reasons is that it's the body’s way of working out his penis. If his penis doesn't get a regular work out, the muscles of the penis can lose elasticity and shrink. So his body takes care of it by itself during dream time - and it doesn't matter what the dream is about either, the body has to do what it has to do!

This article was written by Alle Parson, author of BlowjobHow.com, teaching you how to give a blowjob with tips, techniques and more!