The only thing that I find truely works for me is a detachable shower head, its great b/c you can go out and buy one and
noone would think anything of it, I mean come on how many 13 yr. olds can go out and buy a viberator w/ their parents?! Any way make sure you get one that will reach down far enough so that when you are laying down that it will touch your pussy.
Then when its all hooked up fill up the water in the tub so that it comes over your pussy b/c the power of the water w/ nothing blocking it will hurt you. Than spend a few minutes find where the shower head feels best on you then keep it there and if you do it rigth than it should take at the most 30 seconds while you are masterbating w/ the showerhead close ur eyes and imagine you b/f or ur crush being sexually intimate w/ you.
hope it works as good for you as it does for me