AKA:
Average length (over 18 years): 6-10 cm soft; 12-19 cm erect
Chopper, cock, dangly bits, dick, dong, john thomas, lunch box, manhood, meat, member, knob, sausage, old man, package, organ, prick, rod, schlong, todger, tool, willy, winkle.
Job: Peeing (several times a day) and sex (whenever it gets lucky)
Measuring up: Average length (over 18 years): 6-10 cm soft; 12-19 cm erect
Age when it starts growing: 12 - 13
Percentage of UK males with foreskin removed (circumcised): 25%
Remember: Everyone is different. Smaller penises enlarge more when they get hard. Real men don't care about penis size. Nor do real women.
Problems: Burning when you pee, redness, sores or pain in the penis? Head for the doctor - even if it seems to go away. Take no chances on the health of your tackle.
Testicles
Job: To produce and store sperm.
Measuring up: Average size (over 18 years): 5 x 2 x 3 cm
Age when it starts growing: 11-12
Problems: Painful testicles should always be checked by a doctor. As should any lumps or swellings. Look after yourself.
Sperm
Job: Reproduction of the species
Average size: Microscopic. 1500 are found in a drop of semen the size of a full stop.
Number made every day: 150 million
Number released per orgasm: 40-600 million
Number needed to get pregnant: 1
Problems: STIs are carried in sperm. Avoid these and unwanted pregnancy, with a condom.
Further help and advice
bbc.co.uk/science/humanbody (Scroll down for penis diagram)
avert.org/puberty3.htm (Scroll down for penis diagram)
Written by Dr Melissa Sayer
Last updated 17th June 2007

Kristal, 16
The size makes no difference. If you really love the guy then you don't care. All sizes do the same job.
Rosie, 16
my boyfriend is always asking me to re-assure him that his size is big enough for me and i would just like to say that it doesn't matter because i love him for who he is not his size
Louise, 17
It's not the size that matters it's how well you use it!And any girl that thinks size does matter, really doesn't deserve your time.
Bethan, 15
dani and holly are sooooo right. we really dont care we dont go out wif boys beacause of the size of their penis. and if girls do then they are so shallow. personality counts most and if you've got a 'big one' then thats just a lucky bonus aint it so be confident and happy with yourselves and your body cuz u cant change no matter how much u wish u could
Ocean, 15
Yeah, honestly. We don't care how big or small. We KNOW what it feels like to be told our boobs are too small or we're not the right weight. Girls are more caring than that.I mean.. unless your really picky. :\
lozzz., 17
girls realy dont care how big it is. its you boys comparing them thats making it worse for yourself. if you know how to use it then good on you, we dont care how big it is (:
Holly, 16
I agree with Dani, most girls don't care. I know i don't. I spose it's like girls with their boobs...cept we have it worse off with the interfering media! So don't worry bout your size, and remember us girls are probably worrying more - ten times more.
Sophie, 15
its not the size of the peins its how you use it ;)
Ryan, 14
ye im 14 now and myne is just startin to grow and im not bothered about the size and the people that go on about how big theres is and so on,, they need a life i mean wats the point in goin on about it
JT, 17
From my experience, when girls are turned on, they really aren't fussed how big or small it is, if it's HUGE, then obviously they may well comment, but if you've both already gone through foreplay etc, they generally don't sit around pondering the thing!!!! ;-)As long as you're relaxed with it, don't be too intense and worried about it, you'll be fine. Mine's probably around average, haven't actually measured, but I haven't had any complaints!
Sam, 18
Great my size is fine and that was the issue i was worried about.
lulu, 18
I'm a girl... I find it's the thickness of the penis that actually matters. My boyfriend has a really small penis though and its not even thick yet everytime we have sex i always think 'hmm thats my best sex yet'I think its the way you use it that counts and it also helps if you are really comfortable with the person :)
GIRL, 15
Seriously. We honestly don't care. Think about it. We don't have half as much scope of comparison as you guys do. x
Jake, 16
Im fine with my size
dani, 15
i am a girl, but i just wanted guys to know that moast girls dont mind how big OR small it is, it dusnt matter :)feel confident, and it will be fine... :)
Pete, 16
I Was A Late Starter. All Of My Mates Were Like Mine Is This big And So On. DOnt worry. It WILL Grow. I Now Have One Of THe Biggest Out Of My Large Group Of Friends. SCORE!
Arran, 15
My girlfriend reassures me that my penis size is fine, if you have troubles with your size don't be afraid to talk to your girl because it really made me feel more confident about myself.
Tom, 14
Don't worry if you still have your baby penis it will grow i am 14 and it has just started to grow and my voise is just starting to break so don't worry!!
onelife
boys_bodies_penis