The male sex organ outside the body between the legs. It is made of soft spongy tissue and blood vessels. This is what a male uses to urinate. Most of the time it is small and soft, but when a male gets excited it gets larger and stiff or erect. A penis must be erect for a condom to be put on it. The tip of the PENIS is very sensitive and gives the male a lot of pleasure when it is touched. The hole at the top is covered by a mucous membrane. Germs that cause STDs, including HIV, can get into that hole during sex without a latex condom. This could happen during oral or anal sex. Also through vaginal sex if any blood, cervical or vaginal secretions with STD germs, including HIV, in them get inside this hole. Slang terms: Cock, dick, peter, putz, schlong, schwantz, wang, willie.