One of the fastest ways to reach an orgasm - using a jet spray is highly effective.
You can use your fingers to penetrate yourself, stimulate you G-spot and clitoris.
If you haven't tried this out yet, turn your shower on, and experiment with a variety of temperature settings and speeds.
Dildos One of the more cliche images of the D.
You can use your fingers to figure out which, if any, orifices you're comfortable having penetrated, or if you'd prefer the stimulation stay on the exterior parts of your genitals.
Move your fingers around and find which orifices you are comfortable having penetrated or you can stay on the exterior locations.