If you guys learn NOTHING from me or in life in general, please allow me to kill, utterly totally and ruthlessly, the myth about cat breeding in any way hurting the female cat. You have to believe me, they LIKE IT and they are NOT making all that noise because it hurts!!!
I could go into a long explanation about a cat's pleasure center basically being wired into it's kill center but it gets complicated. Try to think of it this way, it's just like human sex. If you do it right and nobody could SEE what you're doing, just heard it, it could potentially be misinterpreted as sounding like it's a bad or painful, right?
Cats like sex and they're making so much noise because it feels good. All the screaming, hissing and rolling around afterwards is major happy, happy. If you ever have a cat that totally gets into catnip it's very much a similar response.