Penis and testicles
Warts aren't pretty and are highly infectious. Best avoided because although they can be treated, they can't be cured.
A very painful sexually transmitted infection where blisters develop on your penis.
Chlamydia is the most common STI but it's not trivial. Untreated it can cause infertility.
Cumming or ejaculating too soon happens to almost everyone at some point. There are plenty of things you can do to overcome it.
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