The Complementarity of Sex

Heterosexual intercourse is much more than a union of bodies; it is a blending of complementary personalities through which, in the midst of prevailing alienation, the rich created oneness of human being is experienced again.  And the complementarity of male and female sexual organs is only a symbol at the physical level of a much deeper spiritual complementarity.  

John Stott, Same-Sex Partnerships?: A Christian Perspective, p.35