I really like the definition you and your sir wrote.
That pretty much sums it up for me.

I love to be called 'slut' in the bedroom. It's not about how many people I've slept with, rather I'm insatiable for the lust, the ravaging, the beating, the worship, the surrendering and many more things. It's just about the right person recognizing. Coming from said person... it's so damn horny. And like you pointed out, from the wrong person- not such a compliment. In fact, quite derrogatory.

Many words are similar. For quite a long time I despised the word 'cunt'. Now, I'm rather fond of it. If someone said to me 'you fucken cunt'- that's just about grounds to smack them. If someone said to me 'you want me to fuck that cunt, don't you' I may just about cum.

It's all in the intended meaning really.

btw- if that's you in your avatar... gorgeous!