Stéphane Berneau answered on 13 Mar 2018:
There are plenty of variation between humans and the animal kingdom.
– Some animals won’t have an intercourse and fertilise the egg outside (clownfish and frog)
– Some animals will have an intercourse but lay eggs (most birds)
– Some animals will have an intercourse and keep their egg inside the uterus(sharks)
– Some animals will have an intercourse and develop the fetus in the uterus using a placenta (humans, dogs, cats and other mammals).
– Some animals will have an intercourse and develop the fetus in a pocket (marsupials, kangaroo).
This is only if you need a partner.
I have selected a video about sexual conflicts. I hope you will enjoy it.
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