In my own relationship (38 years) dirty talk is used, but never degrading. The use of cock vs penis, pussy and cunt vs vagina, are common terms used in our sexual play. We also both enjoy oral play--her sucking me or me going down on her--but again no derogatory references. I would never say "suck my cock, bitch" and I'm pretty sure if I did, the blowjob would be anything but pleasurable.
That said, we are also not in to pain or bondage. Of the people I know who are into these as elements of sexual play do occasionally like references to degrading terms. However, it is far more common for derogatory terms to be used for men in those situations.
I think women already face too many situations in real life where they are treated as second class to find 'abusive' language to be a turn on.
- Just my thoughts.