Strap-on masturbation
From Voyeurweb's Wiki about Sex
Strap-on masturbation is a type of female masturbation involving a special female masturbation technique: A woman strokes an imaginary penis represented by a Strap-On. Very often the masturbating girl imagines that she virtually has a penis or is stroking a penis, while at the same type the stroking on the (numb) penis is transfered to her clit. Strap-on masturbation is very often combined with nipple stimulation because usually her pussy region cannot be reached easily while she is wearing a strap-on.

