Now there have been truly scientific studies done of Identical twins which have identical genes. If homosexuality was a biological condition produced inescapably by genes then if one identical twin is homosexual, in 100% of the cases his or her twin should be as well. Using a sample of 14,000 Australian twins, they found that if one twin was homosexual, 38% of the time his identical brother was too. For lesbianism, the rate of concordance was 30%. If homosexuality was genetic the rate should be right near 100%!