1) Water forced accidentally up the urethra can be very painful. Its a small space, and its only meant to be one way.
2) Water inside your vag isn't a great idea. A little water isn't going to hurt you, but too much of anything stands a chance of throwing your little ecosystem out of whack. Results can be things like yeast infections, which are not fun.
3) Strong sensations like water pressure can increase your sensitivity threshold. In other words, if you overstimulate something, it takes more sensation to stimulate the next time.
Its not permanent, but a common similar experience is girls who use vibrators regularly. They sometimes find themselves a bit desensitized to normal stimuli and it takes the intensity of the vibrator for them to enjoy it. Eventually, they have a hard time feeling even that.
hitler_the_goat answered Saturday June 6 2009, 5:22 pm: HAHAHAHAHAHA! look, who do you think invented that clever little movable shower head? some chick that loved to masturbate, thats who. no, it won't damage your girl parts, unless you decide that its time to scour the fields with some boiling hot high pressure water. enjoy your self play, and be mindful that people will wonder why you're taking 90 minute showers, so keep your masturbation to reasonable levels until you have the house to yourself for a few hours.
hope your water heater is big
-gunner [ hitler_the_goat's advice column | Ask hitler_the_goat A Question ]
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