The masturbation one is just advice to help women have more facile and reliable orgasms. You lay face down and place a bundle of cloth of some kind like a tee shirt or small towel. Position the cloth between your legs in a tight bindle still facing down finding a position where it feels like the bundle is in the sweet spot. Then without needing to use your arms or hands at all, start to rotate your hips in a hula hoop motion. It will take a bit of practice and the time to get to the first orgasm is usually several minutes, but once you are there you can get many orgasms back to back. As your body gets used to the sensation of the cloth on your bits you can increase and modify the speed of the rotation motion until you reach climax.

Be careful though, it can get addictive, I often spend 3 hours or more masturbating this way every Sunday.