YOU use it every day, and may even call it your pride and joy, but how much do you really know about your penis? You might think you wake up with an erection because you've had a rather erotic dream, but the real reason is far less sexy. Whatever you call it, schlong, willy or todger, your member performs some rather impressive tasks.
In fact, the evolution of the human race has depended on a man's ability to get an erection - so we can safely say your dad's worked. But that being said, your manhood is also capable of letting you down no pun intended and is also slightly uncontrollable. You can actually break your penis - think shattered urethras and torn muscles - enough to make the burliest man wince. From the moment you are born to the time you take your last breath, here are nine things you may not have known about your penis.
That's because having a full bladder stimulates nerves in a similar region to the nerves involved in getting it up, and an erection inhibits your ability to wee. But the same thing can happens when women have a full bladder - their clitoral nerves are stimulated - so it may not be as simple as that.
Sleep erections can actually be a useful diagnostic tool for erectile dysfunction. If a man can get an erection when he is asleep but not when he is awake then it is a fairly clear indication that the issue is a psychological one and not physical. And if you are wishing more of it was on the outside you may want to think twice because it needs to be that far into you body to remain connected to your anatomy.
There have been studies to suggest that thinking about something else can delay the grand finale, but the part of your body that controls your orgasm is actually in your spine. Studies are currently underway to see if stimulating this region can help provide a cure for premature ejaculation.
A study published in BJU International found that there is no correlation between foot size and penis length. Another study, published in the International Journal of Impotence Research, found "penile dimensions are significantly correlated with age, height, and index finger length".
You may have thought this ability is something that develops when you have hit puberty but the fact is many penises are born ready. And even before birth some ultrasounds have picked up a fully formed erection, according to Medical News Today. A study found foetal erections occur the most during rapid eye movement REM sleep and they can happen several times an hour.
On the topic of erections and sleep, that's something that happens to men throughout their lives, but more on that later. Here's something that might cheer a lot of men up about death - sometimes you can get it up one final time even once you've passed on.
Scientists believe it's caused by pressure on the part of the brain responsible for erections. It often happens during very passionate sex and occurs when the covering of the erectile muscles ruptures - a word no man has ever wanted to hear while getting frisky. There are several dangerous positions to put your manhood in, think doggy style and cowgirl, and it's painful enough to put a halt on all proceedings for some time.
Although, hats off to this guy who fractured his penis during a passionate romp with his girlfriend only to keep going and notice 12 hours later. Studies have suggested that the angle your member dangles at determines the way it points when it stands to attention.
You've heard the saying "show-er or a grower" before, but it actually holds very little value. A study of more than men has previously found that there is no relationship between the length of a flaccid penis and the length when it's erect. Some men do grow to be a bigger size when they are turned on lucky them but it's perfectly normal if yours remains the same length.
But don't worry if you're a little on the small side boys, there is no suggestion well endowed men are any better in the sack. We pay for your stories! Do you have a story for The Sun Online news team? Sign in. All Football. Andrea Downey. Giovanna Fletcher on love, Brexit and wanting to snog Emma Willis. Kate Middleton's pal who runs posh sex club reveals saucy '50 Shades' dungeon.
Bizarre app 'RealDollX' lets randy users create sultry virtual girlfriends. Comments are subject to our community guidelines, which can be viewed here.