I actually recently had a very candid chat about "gender role" dynamics in the bedroom with one of my friends who identifies as pansexual. In my
opinion some people are simply born "subs" and others "doms" and still others are "switches", so use the lingo. My friend is in a stable and completely equal relationship with a male, but she is also a submissive in bed. You'd never guess it from her outward demenor, but she simply can't get off unless she's in a submissive position. She needs to be called names and restrained in 'scenes' or else she simply doesn't enjoy herself.
For me, when I was still identifying as female, I found sex to be a chore because most of the men I dated at the time were dominants and I simply was not a submissive. I forced myself to act "subby" to please them (which was also part of the issue). But, then I met a male who was a sub in bed (again, I don't think dominant and submissive behaviour inside the bedroom has much to do with behavour outside of the bedroom) and I found that I enjoyed sex with him immensely because I always topped and I could to pull his hair and bite him etc. While I was still exploring I also dated a guy who was very much a dom in the bedroom (and again, a sweet, considerate, and loving person outside of it), and I HATED being in that position. I later slept with a girl who was sweet, shy, and soft-spoken by nature, but inside the bedroom I was shocked to find that she was into spanking her partner, face slapping, using words like "slut", and leaving bruises as well as spitting on her partners... (which wasn't enjoyable for me at all).
I don't think dom or sub behaviour in the bedroom has much to do with non-sexual activities or personality. I wouldn't be surprised to learn that "submissiveness" or "dominance" in the bedroom had to do with foetal hormone exposure, much like sexual orientation and gender identity.
Though you might not get off on being called "whore", some girls do and so do some guys. It's just another one of those interesting facets of human sexuality that we probably won't ever compleately understand. I think it is important that you communicate with your partner(s) so that they know what is kosher in bed ahead of time and so you know what they are into. Going back to my experience with the girl who was secretly a dom, I would have REALLY benefitted from knowing what she was into ahead of time. I think she was probably afraid that I'd back out of it once I knew and wanted to ease me into it... but yeah, don't do that!
Safe words are also important, I think, even if you are having sex that is completely vanilla. I was being pegged by a girl once and at one point it started to hurt like hell but do to a miscommunication she didn't know that I wanted to stop and I had to forcefully push her off to prevent myself from being injured and that completely killed the mood. Beyond making certain that your partner is always concenting to all that you'd like to engage in, safe words can also be used to call time-out if you are in pain in any way.
SET UP GROUND RULES BEFORE SEXUAL ENCOUNTERS HAPPEN! Everyone is better off that way: you know what not to do and also how to turn your partner on by finding out what both of you are into.
Pornography is another discussion for me, as I find much of it unethical and you are hard pressed to find any free and ethical porn sites. So, I'm just commenting on the idea of gender roles in the bedroom.
Also, you should check out
this play by, Peter Ackerman. Your comment about racial slurs in bed reminded me of it.
tldr: Dominant and submissive sexual behaviour has nothing to do with sex, gender, or sexual orientation. Dom =/= male. Sub =/= female. Sexual preferences or vulgar language kinks =/= inherent sexism. If your partner is doing something that makes you feel uncomfortable in bed, say something! If your partner is not pleasing you, then don't just appease his or her ego by pretending to enjoy yourself. Sex should be fun for both parties.
Also, please please please, stop generalising all men and all women.