I professionally studied this, so I would know. It is not forceful. Cats have paws not hands, and when the make cat mounts, he cannot see what he is doing. God forbid he, um, sticks it in the wrong hole. He bites her neck to hold her in one position and keep her there while he aims, and, well, shoots, for lack of better terms. Female cats have a habit of squirming and moving around.
When he finishes and withdraws, females often turn around and smack him in the head. They do that to punish him for withdrawing. Male cats have stiff, bristle like hairs on the shaft, which point away from the tip. That makes penetration easy, but withdrawal causes the female discomfort and even sometimes pain.
Male cats are actually very affectionate and gentle when pursuing a female cat and mating with her. This is true for both small and big cat species. Lions, for example, are fearsome predators who suddenly transform into gentle giants when pursuing and mating with their females. This idea that it is forceful or aggressive in any way is complete nonsense. I promise you that I have reviewed enough hours of footage and made enough field observations to be certain of this.