I don't do nudes myself. But I technically advise a friend of mine who does a lot of glamour portraits and nudes. He began nudes when he already had some beautifull results to show as a portrait photographer. Women, men and couples came to him for portraits, sometimes a nude back etc.
Because he inspired confidence and because his wife assisted him sometimes, he could suggest topless pictures. He showed these pictures on the web (with consent ofcourse) and started attracting new customers who deliberately came to do nudes. Now he does nudes 50 % of his time.