Talking to myself 
I keep thinking about this, and all the discussions on here about 'pejorative' words used against women. What does slut actually mean? IS it pejorative?
Sexually available - yes, why not?
Promiscuous - Maybe, and why not?
Wearing skimpy clothes - Yes, and? It's fashion.
Asking to be sexually assaulted - Not.
If a woman wants to be sexually assaulted (and I have seen such women, whatever their problems may have been), she tends to approach her targets with specific invitations.
There is nothing in sexual availability, promiscuity, dress or any other non-verbal, non-specific invitation that warrants the assumption a woman is 'asking' to be assaulted. That assumption is purely a construct in the minds of misogynistic men. Therefore, the word itself and its connotations are all invalid.
"I am a slut" can only be a self-pejorative statement in the eyes of such men, or of women who share their ideas (chastity, modesty, proscrbed behaviours).
So the slutwalkers are right, imo.
As it happens, I'm not a slut these days. But I was, and there's nothing wrong with it.