No, of course not, madg. Being polite is a learned behavior. One of my sons is far more polite than the other, despite the fact that they both receive the same bringing up. The twins thing shows that homosexuality is not genetic; therefore, it must be the product of environment. That doesn't mean that the effects of environment will always be the same - especially because, even with twins, they rarely experience that exact same things in life. One may be favored by the father, one may develop more of an interest in sports, etc. etc.