Penis and testicles
Klinefelter's syndrome is a genetic condition that only affects males. KS men tend to have less body hair and more feminine features.
An erection that won't go down is called priapism. It needs treatment if it lasts 4 hour or more.
Ian, 40, a musician from north-west England, has paruresis or shy bladder syndrom
David, an IT consultant from the English Midlands, has paruresis or shy bladder syndrome.
Ever been standing at a public urinal and found you couldn't go? You're not the only one. It even has a name - Paruresis.
STI's are the group of diseases transferred through sex. You know the drill: wear a condom.
Penises come in all shapes and sizes and usually there's nothing to worry about.