I saw a bizarre and somewhat disturbing product advertised today, the VibeRider Motorcycle Seat Vibrator. It is a vibration device meant for sexual pleasure that one can install discreetly in the rear seat of a motorcycle. The device varies its vibration in concert with the bikes RPM, as well as inputs the driver makes to a control box.
I'm sure the vast majority of people who buy this device are right minded souls who will only use this with their informed and consenting partners. But as I read comments from potential purchasers on a few different sites I realized that this device could be used to diabolically, insidiously sexually abuse a lot of women. Someone with this device could invite a non-partner to get on the back of the bike and could then subject the passenger to vibrations which the passenger may not even know were being generated for their non-consenting sexual pleasure, rather than simply vibrations caused by the bike as part of its normal operations. And that makes this product potentially scary, and somewhat unique in the danger it poses.
Someone walking up to a non-partner and without consent putting a vibrator against the other person's genitals would pretty roundly be recognized as sexual assault. But I can imagine many people claiming not to understand that this is the same thing. Maybe the offender would claim "It was just a joke." or "But the bike is already vibrating, what's the difference?" And well, there's a quite profound difference: intent.