I can't really understand the 'equal rights' arguments for gay marriage advanced by Matthew Laughton (Write Back, May 29). Civil partnerships provide gay couples with exactly the same rights as married couples.
But it seems to me there is a good case for restricting marriage to heterosexuals, to maintain the link between marriage and the birth and nurture of children.
To offer an analogy from a more trivial area: is it contrary to the principle of equal rights that novelists are not allowed to enter their works for the Turner prize?
DR ROBIN ORTON