Nothing to stop hospitals from flushing used drugs: Harvard Medical School The feminization of male fish, as a direct result of water pollution, is a continuing problem. According to researcher Natasha Gilbert, up to 86 per cent of male fish in some areas become femalelike as a result of exposure to widely-used contraceptives and anti-inflammatory drugs dumped into toilets and sinks. Some of the substances have an impact on fish livers, kidneys and gills. Exposure to some substances causes male fish to develop female anatomy and to produce the egg protein vitellogenin. The resulting fish are known as ‘intersex’. The main culprits include: prescription and over-the-counter drugs, perfumes, cologne, skin lotions, sunscreens, pesticides, petroleum products, strong…