i dont think that applies to everyone.
some people just dont feel comfortable talking like that. it may have something to do with being shy or how they were raised.
Not everyone is into that whole "talking dirty" thing.
I've personally done it..and sometimes its been ok and sometimes not. for me it's a mood thing and it depends on who the man in my life is and where our relationship is at and if we have that kind of sexual relationship.
It's definitely not something i've done often...it's just not really my style.