This article from the Guardian, which you can read HERE is really quite entertaining.
Natural it may be, but animal reproduction can be a mighty strange business. Barnacles, for instance, have a penis 30 times their body length. Male snakes have a forked organ, allowing them to dodge the female’s tail and penetrate from either direction. Hedgehogs plug their partner’s vagina with excess sperm to stop anyone else’s getting a look in. Blue fairy wrens have testicles 25% their body weight. The female hyena picks and dumps her male as she sees fit, and has even evolved genitalia that look like a male’s