Let me start by saying I have no degrees in the following subject and no professional insight. I am merely using observation and personal experience for my reference and therefore it is just my opinion.
It's true that many couples enjoy using dirty talk to spice up their sex life. Also true is the fact that many people would like to include erotolalia or the use of dirty words in their sex life but are afraid of overstepping boundaries or offending their partner. It is anybody's guess how many people would desire to perform this practice and yet at the same time, do not know that their partner wishes the same.
In what may seem irregular or against the norm is there may well be more women who enjoy erotolalia than men. This could stem from the fact that women at one time would be considered crude to use vulgar language. This fact may make dirty talk naughty or erotic if you will and thus just that much more exciting to the female.
The biggest problem for those who wish to bring erotolalia into relationship is the worry of acceptance by the other party. My suggestion is to introduce dirty talk slowly and to watch for signs from your partner as to whether they like it or not. If a woman was to, let's say, scream out suddenly,
"Fuck me with your big cock,"
It might not only surprise him but shock him as well. As we all know, the fragile male ego may lose concentration when surprised and often erections as well. However if the partner was to whisper in his ear, something such as,