We've been told for a while now that wearables are the future of tech but perhaps far fewer people envisaged they could help save the planet in conjunction with masturbation.
Pornhub (who else?) have created the Wankband, a wearable fitness devices that converts and stores kinetic energy which can then be used to charge your gadgets.
The watch-like device contains a valve that holds a small weight. When your wrist moves so does the weight. And which activity is best suited to a rhythmic up and down motion?
The future. Maybe. Well...
Yup, that's right - jerking off.
Now such a device is unlikely to solve all of your energy needs in one erm... session, so how much energy it produces depends on your stamina and possibly your loneliness.
The Wankband is still in the development stage but eager beavers can sign up to be a - hilariously titled - 'Be(a)ta Tester' here.