In the real world:

If a woman whom a man wants to sleep with refuses him, she's a slut

If a woman pisses off another woman, she's a slut

If a woman cheats on a man (particularly with numerous partners), she's a whore

If a woman steals another woman's boyfriend, she's a whore

In porn...

"Slut" and whore are the selling points. Catchphrases. If they were taken out then porn wouldn't be as exciting or different.

Intelligent people don't let porn, which is a fantasy, enter into reality.