I find, as a clean freak and a water freak, the best masterbation technique for me is to run the shower (not the bath-the tub fills up too fast), lie down beneath the spray and clean myself with my favorite body loofah and body wash. I find a scent in the stores that really turns me on.
After I'm all clean and feeling turned on, I get a toy off the shelf, and start rubbing my breasts with it. I work it down slowly, until it hits my clit. Then I continue to slide it along my pussy, out, around, and finally in, while rubbing my clit. I also like to use my finger, and feel the inside of me. I do this for a good 45 minutes. The shower length, the heat, and the water hitting my clit and my pussy is a guaranteed hit every time.
For a little variation, if I'm lucky enough to have time after the shower, when I am still hot and wet, I place a self-staying dildo (or anything with a base) on the tub's top, where you'd sit down, and with a rug/towel under one foot, and a bathmat under the other for safety, hump the tub and the dildo, and I'll be coming again in no time! A second variation I love is to put a full length mirror on the floor next to the tub so I can see myself doing all these fun things.
Enjoy. Hope I gave someone some great ideas. This Website has been wonderful for me and soooo much fun!!!!