Pornhub thinks it has a sexier solution for the age old problem of a gadget running out of juice prematurely, and the secret is in the (hairy) palm of your hand. Say hello to the Wankband: a wearable that straps on to your forearm, capturing the energy from a spot of self-love and using it to charge basically anything via USB. You see, inside the band resides a weighted ball that travels up and down in a tube with a flick of the wrist, and from there the kinetic energy's stored until your gizmo -- or sex toy -- of choice needs a charge.