Porcupines

Be grateful you were born human because this one is bound to make you cringe. Especially since porcupines have a very bizarre mating ritual. First of all, the female is only interested in sex for about 8 to 12 hours in the year but this is not surprising considering how the male woos her. 

The male stands on its hind legs, waddles up to the female, and then sprays her with a huge stream of urine! If she's impressed by its smell, she'll rear up to expose the good stuff and allow him to mount her! However, if she doesn't, she'll scream and shake the urine off. How humiliating for the male indeed to have his urine turned down!