Originally Posted by
Beardedsumo
The most common "assist" in maintaining an erection is mechanical - the "cock ring." It compresses the veins slowing the draining of blood from the erection. There are elaborate elastic devices, actual metal rings, or a simple piece of twine. Homemade devices can be dangerous if they constrict too much blood flow.
Men can also train themselves to keep from ejaculating, sometimes as easily as thinking of multiplication tables at the right moment instead of the sensation.