Tender foreplay and cuddling are not devoted to the greatest SM lovers of the animal kingdom. With them, pain - and sometimes even death - must be involved to pass on the genes.
And whisk! Flatworms determine who the female will be through a duel with their razor-sharp penises (the white spine in the picture). Whoever is first pierced loses and receives the role of the mother. That is an exhausting task, because the care for the fertilized eggs takes a lot of energy. However, the violent sex life of the flatworm is nothing compared to that of the five lovers below.
1. Marsupial mating itself to death© Natural Vision
The broad-footed marsupial mouse Antechinus stuartii looks cute, but under the soft fur is a sex maniac. In the mating season the male is overflowing with testosterone and is getting rough. He leaves the females with a swollen neck and open flesh wounds.
He himself is not exactly without problems: after a few weeks of sex, his kidneys and immune system are so affected by the stress and hormones that he succumbs to it.
2. Penis breaks off© Alamy / Image Select
The only task of the drone in the hive is pairing with the queen. The act with Her Majesty, however, is a painful affair.
When the drone reaches its peak, it falls backwards. His barbed penis, however, is still firmly attached to the queen and is torn off. The male dies a painful death.
The penis of the bee is full of barbs and breaks off, giving the mating a painful end.© Powered And Syred / SPL
3. Dominatrix with tentacles© Shutterstock
The female of the squid Tremoctopus violaceus weighs up to 40,000 times as much as the ugly man. While mating, she embraces him with his tentacles, causing him to choke slowly.
4. Sex arrow weakens partner
The snail on the left fired its 'sex arrow' at its partner, but it was wrong. The white ammunition has landed next to the right snail.© Steve Downer / Ardea.com
Sex-seeking snails run the risk of being pierced by a sharp arrow during foreplay. The arrow is bad for the life of the snail and the production of eggs, but it paves the way for the sperm.
Snails are notorious strangers, but once they are hit by Cupido's arrow, they no longer want to go looking for other sex partners.
5. Female stabbed with razor-sharp penis
The bedbug male puts his sexual partner in her shield anywhere. This form of mating has the appropriate name 'traumatic insemination'. When he has injected his sperm into the female's body, the sperm cells find their way to the eggs.© Rickard Ignell, Swedish University of Agricultural Sciences
The bedbug does not waste time on dating, foreplay or even searching for the female's aperture. He just sticks his razor-sharp penis through her shield anywhere and sprays his sperm into her body.