Applying ultrasound to testicles could be an easy method of contraception since it temporarily destroys the germ cells that produce the sperm

The researchers said that the technique produces temporary infertility in men which can be reversed later on. However they admitted that more studies need to take place on the subject in order to ascertain how long the effect lasts and whether it is safe to apply the beam again and again.
“Further studies are required to determine how long the contraceptive effect lasts and if it is safe to use multiple times”, lead researcher Dr James Tsuruta said.
Source-Medindia