I' ve seen providers who appear to have taken a vow of silence. I've seen others who appear to be auditioning for a gonzo video.  I remember a well-reviewed and high fee provider who got so ahead of herself with the dirty talk that she forgot where she was: "Oh yeah fuck my tight sweet tits!"  Tight "tits"? I was banging her doggie at the time but apparently she got her script lines mixed up.  Just do what works for you ladies--the less it feels like acting the more you and your companion will appreciate it.