Being "slutty" in bed

When my boyfriend of 2 years and I have Sex... He sometimes says "be a slut for me" or "I want to f*ck you like a slut." It doesn't bother me that he says this, he just wants me to be dirty or talk dirty to him. I'm pretty shy-does anyone else's s/o say this? Or do you say it to them?

It turns me on..

Any tips on how to be "slutty" in bed?