A vibrator? or a massage baton. or, any sort of dildo attached to a motor. Ive heard even of using electric blendings with jello. :O
The same reason why guys whack off, because they aren't able to find a member of the opposite sex to give them what they need, though the circumstances certainly come into play (such as no decent...
yes
Vibrators are used for masturbation.
Naturally. That is what they're for.