“The anti-impotence drug not only speeds sperm up, researchers found, but it also caused the vital reaction needed to penetrate an egg to occur prematurely…

“Most use it for impotence and aren’t contemplating having a family, so this has no implications for them,” (one of the study’s authors) says. However, younger men are using it recreationally, and they may be trying to start a family. Furthermore, an audit of fertility clinics by the team revealed that 42 per cent use Viagra to help men produce sperm samples on demand.” —New Scientist