Ralph made it seem as though marriage was only about sex in the post above mine Gary. I should have quoted him. And we judge pedophiles because it is against the law to have sex with children, not another consenting adult. Incestuous marriage is illegal to protect society from mutated offspring. I think that you should be able to marry whom ever you like, as long as they are of age and consent. People of close relations should not be allowed to reproduce because of the dangers to any offspring.
Polygamy is rife with abuse and should not be sanctioned by any state out of concern for the children being raised by people who allow 50 year old men to marry and impregnate girls under the legal age of consent, which we know for a fact happens.