A contraceptive treatment for men is being put to the test as part of a research project in Manchester.
Scientists at Saint Mary's Hospital, which is part of Manchester University NHS Foundation Trust, are looking for couples willing to try the contraceptive gel.
Called NES/T, it suppresses sperm production in men if used daily, with the gel applied to their upper arms and shoulders.
Researchers say they're keen to explore alternatives to traditional contraceptives such as the pill, which can cause many women to experience uncomfortable side effects.
The two-year trial will require participants to use the gel as their sole method of birth control, with the men taking part attending at monthly clinics to monitor sperm production.