To be horny means that a person is sexually aroused and in need of sexual gratification. An erect penis is usually one of the most obvious signs of horniness in a man, while vaginal lubrication is often the most obvious sign of horniness in women. Horniness can be relieved by having an orgasm.
Sexual arousal has been known by many names throughout the years. The term horny is believed to have derived from the fact that a man's erect penis bears a small resemblance to a horn, such as that of a goat or other animal. Men that had erections were deemed to be "horny". Today, however, the term is used to describe sexual excitement regardless of gender.
