Lets look at cats for a moment, since my un-neutered cat is trying to molest the other cats in the house. The male bites at the neck, forcibly pinning the female while he does his thing. (I'm sure I don't need to go into great detail about cat sex).
This is nonsense. Not only is cat sex (usually) consentual, but it is impossible for cats to concieve without it. Queens only ovulate
after their first sexual encounter, when the backward facing spines on his penis rake across her vaginal walls. Thus Cats will usually meet and copulate more than once, roughly 24 hours apart. Queens not only solicit sex but are well capable of rebuffing the efforts of Tom cats over whom they are dominant in cat society. Toms do, indeed, grip the back of the neck and need the back and shoudlers of Queens during mating; but your description of it as forceful penetration is simply projection.