Scientists say they have shown how male homosexuality could be passed from generation to generation. Nature encourages mothers to pass on a "gay trait" to their male offspring by boosting their fertility, the Italian University of Padova team believes. This would keep the pattern of gay inheritance alive, they told the Royal Society's Biological Sciences journal. Critics of the theory argue a gay gene would eventually be wiped out because gay couples do not procreate. Inheritance theory There is controversy about whether sexual orientation is a matter of choice, the authors of the study admitted to the journal. Campaigners say...