With an estimated 41 million people visiting it every day, Pornhub figured it might be time to channel all that energy into something more useful than brief, boredom-relieving ecstasy.

"Every day, millions of hours of adult content are consumed online, wasting energy in the process and hurting the environment," the porn site writes.

"At Pornhub we decided to do something about it. The first wearable tech that allows you to love the planet by loving yourself."

The band creates power when moved in an up and down motion, with a kinetic charger inside storing the clean (albeit slightly dirty) energy generated.

It can then be connected via USB to smartphones, tablets and computers, powering them with 100% sustainable energy.