Anyway, if you saw the movie based on the comic book adaptation of the character, you were also introduced to Thor's rival, Loki. And Loki got horse-raped.
The convoluted and frankly baffling legend goes like this: When it was time to build Valhalla, the gods hired out the job to a builder. They gave the guy a deadline -- it had to be done in three seasons or there'd be no payment. The builder said "Sho' nuff" and got right to work with the help of his magical super stallion Svaoilfari.
Apparently the builder did the backbreaking labor while the horse dealt with the paperwork.
Anonymous construction worker and Superhorse were just about to finish ahead of deadline when the gods decided to stall him so they wouldn't have to pay. Clearly the way to do this would be to have Loki take the form of a mare to lure the builder's horse away from his work. Sexually.
As opposed to, you know, shooting it. Murderally.