"Horny"

[Wilson Gray]

Ca.1963, IIRC, the late, great Raven McDavid reviewed a slang dictionary for
Language. He noted that the compiler claimed that the word, "horny," in the
sexual sense was "of unknown origin." McDavid then stated that anyone
familiar with common farm animals knows the origin of the sexual sense of
"horny." Further deponent sayeth not.

Does anyone know what in hell he was talking about?
--
-Wilson Gray