Bike Vibrator!
British girls have all the fun. UK funshop SexShop365 has released the Happy Ride, a bike seat cover with a built in vibrator, so when you're huffing and puffing down the road you can have an orgasm somewhere around 1st and Main. I suspect this would be of greater benefit on a stationary bike, where you're less likely to fall over, or get funny looks from the guy in a beat-up F150. If they start putting vibrators in everything that women sit on, nothing's going to get done once they make the Office Chair Happy Seat. Too much distraction, and the janitor hates all that clean-up afterwards.
Picture via.