Necking giraffes

Among giraffes, there's more same-sex than opposite-sex activity. In fact, studies say gay sex accounts for more than 90 percent of all observed sexual activity in giraffes. And they don't just get straight to business. Male giraffes know how to flirt, first necking with each other - that is, gently rubbing their necks along the other's body. This foreplay can last for up to an hour.