Rudra prasad jee, 'genetic basis' is not the basis for saying that something is normal or abnormal. ok, so pedophilia has a genetic basis, so what? dreaded diseases like various cancers and Hemophilia also have a genetic basis, so r they normal? the whole point is that u don't say whether a behavior is normal or abnormal on the basis of 'genetic inheritance'. that is where the issue of 'mature, consenting adults' comes into picture.