The failure to demonstrate a genetic basis for homosexuality doesn't prove that homosexuals are not born that way, but then, it doesn't have to.Got that right, there are other more obvious markers. Long term incarceration in prison, so-called bi-sexuality, the fact that there are ex-gays and of course “CONFESSION”.
And think of the fellows who father children then declare they are homosexuals. Did their genetic coding change on them at mid-life?