'God divided mankind into two classes, namely male and female, or a he and she... Therefore each of us must have the kind of body God has created for us. I cannot make myself a woman, nor can you make yourself a man; we do not have that power. But we are exactly as he created us; I am a man and you are a woman. Moreover, he wills to have his excellent handiwork honored as his divine creation, and not despised. The man is not to despise or scoff at the woman or her body, nor the woman the man. But each should honor the other's image and body as a divine and good creation that is well pleasing unto God himself.'
Martin Luther in John W Kleinig, Wonderfully Made: A Protestant Theology of the Body, p.23.