We both are aware that Sex is played out in the mind. Dirty sex in its connotation is not about the physical, but rather the mental and psychological interpretation. The term “Talking Dirty” would be used to titillate the mind more than the physical aspect. It conjures up the idea of steamy sex and draws up images in the mind of what is to come.
Dirty sex would mean slightly different images to a man and to a woman. A man’s interpretation of 'dirty sex' would be a woman who seems quiet and sensible and yet you get her in the bedroom and she's a kinky devil; experimental with positions, has a drawer full of toys/outfits, talks dirty etc. Dirty would be the rough and tumble mixed with a bit of oral, mixed with a bit of biting, scratching, in short a woman who would do a bit of everything.
There is the normal everyday sex, which is leisured and mechanical, that one can term as making love and then there is the sex that is naughty and meant for special days, the hardcore. The pvc, toys, paddles, bondage, the smacking, the whips, the high heels, the peeing and whatever your mind desires. There are no limitations. Only the mind can limit the extent that one can indulge the senses.
Dirty sex, draws up visions of pornography, where there are no limits and encompasses any and all kinds of sex. So it could be sex in the car, sex in public, a quickie in the bathroom with the kids watching TV in the living room, having sex standing on your head, tying up your partner to the bed . The more risqué the better.