I know that sexual dysphemism are offensive,harsh and rude.
On the contrary, sexual euphemisms are indirect, polite and pleasing.What is the line between sexual euphemisms and dysphemisms? I think the judgment of line is quiet subjective. Can anyone tell me? Thank you.

Can anyone give me examples of sexual dysphemism?
I have some examples as the following list:
But I'm not sure whether they are dysphemisms or not.

(1) Dysphemism：screw
Meaning：To have vaginal or anal-intercourse with someone or to copulate.
Example Sentence：I gonna screw you gently.

(2) Dysphemism：ride the wild pony
Meaning：Of a female, to copulate with a man.
Example Sentence：Fantasy Dove is a really strong ponygirl and carries me with ease. Her figure is muscular without losing the femininity so she looks great in her pony gear. To ride her is to feel the strength and power below you.

(3) Dysphemism：feed the cat
Meaning：Of a female, to copulate.
Example Sentence：

(4) Dysphemism：breed
Meaning：To have sexual-intercourse and procreate.
Example Sentence：My father warned me about people like you. He said,

I think these are all dysphemisms, bro, with the possible exception of, 'feed the cat.' Never heard that one before.