A dose of ultrasound to the testicles can stop the production of sperm, according to researchers investigating a new form of contraception.

A study on rats published in Reproductive Biology and Endocrinology showed that sound waves could be used to reduce sperm counts to levels that would cause infertility in humans.

Researchers described ultrasound as a "promising candidate" in contraception.

However, far more tests are required before it could be used.

Emergency contraception can now be obtained without charge from pharmacies across Wales.

Community pharmacists in Wales can also give the "morning-after pill" to under-16s, if clinically appropriate - a move that has angered campaigners.