Human bisexual behavior may be hereditable. Purely homosexual behavior is not. That is, homosexual behavior is not hereditable if it is pure and lifelong. Th

Human bisexual behavior may be hereditable. Purely homosexual behavior is not. That is, homosexual behavior is not hereditable if it is pure and lifelong. Those who engage in heterosexual behavior before discovering/deciding/whatever that they are not hetero have the chance of passing on their DNA.