While humans certainly have some odd courtship and mating behaviors, that's a much larger topic than I care to tackle. Animals, on the other hand, are a lot easier to figure out Below, I've highlighted some of the more entertaining courtship behaviors from the animal kingdom.
Bowerbirds - Male Bowerbirds in New Zealand and Australia spend the majority of their time building impressive abodes for the purpose of attracting as many lady friends as possible. Below, you can see how one male bowerbird has created a place worthy of an HGTV special. He's assembled moss, berries, and even snail shells to create this earthy little love shack.

His setup is actually very similar to Leon Phelps' skanktuary in
The Ladies Man, though I doubt he keeps "Piña Colada Butt Lotion" on hand.
Seahorses - Seahorses get things started in the same way that a lot of humans do - by dancing. The pair will wrap their tails together, swimming and dancing for as long as 8 hours until the female deposits her eggs into the male's pouch. From there, the male seahorse will complete the process, carrying as many as 2000 baby seahorses until their birth. 10 to 25 days later.

Pond Turtles - Some male pond turtles flaunt their "fingernails" in hopes of attracting a female. If the lady isn't taking notice, he'll swim in front of her and wave his nails in her face. Imagine if human men did that...
It's also interesting to note that female Spotted Pond Turtles are able to save the male's sperm for up to 5 years and use it later to lay eggs. That sounds like a paternity suit waiting to happen.

Prairie Voles - Male prairie voles are, without a doubt, great husband material (assuming you're a vole, anyway). When the male vole finds a hot, single female vole, he hangs around for a few days until the female is ready to proceed. Once they have mated, they are nearly always monogamous until one partner dies. Researchers who set traps in the wild to catch prairie voles frequently find pairs in the same trap, due to the fact that they spend so much time together.

Elephant Seals - If the male elephant seal could talk, he'd probably say something like, "Dem's mah hoes!" while referencing a small herd of lady seals. Some of these prolific lovers claim seal harems of as many as 50 females, and they defend their territory viciously.
When approached by a male on his territory, he barks out the seal equivalent of, "I'll cut you, fool," and proceeds to launch into a fierce and bloody battle for the ladies in question.
