Could be due to a lizard!

JAG has come up with a very good question, one that I had to really
do some deep research on. But I feel I have got the answer you have been
needing. (JAG I have another one I will e-mail you later)

Q: Did the word "horny" come from horny toad?
( for those of you that don't know a horny toad is a lizard that lives in Austin Texas)

A: YES; Because the only thing we humans have in common with this lizard,
is we are always chasing tail!

I hope that this clears it up for you.