If this really did last 10 days it would be great.

Men in Serbia are lining up to have electric shocks delivered to their testicles as part of a new contraceptive treatment. Serbian fertility expert Dr Sava Bojovic, who runs one of the clinics offering the service, said the small electric shock makes men temporarily infertile by stunning their sperm into a state of immobility.

I question how long it lasts because a man produces sperm constantly. The only way to be sure your sperm is sleeping is to zap it before having sex.