As long as an adult male and adult female can marry, marriage isn't in danger. If a man wants two, three or six wives, it's his headache. The same goes for a woman. If she wants more than one husband and they are agreeable to it, more power to them. The line is drawn at bestiality and pedophilia. Those must remain a crime.
Why? In every other country that has legalized same sex marriage it has also legalized bestiality. Some countries have legal animal brothels.
Demark, Sweden and Norway all have legalized sex with animals.
Animal brothels legal in Denmark | IceNews - Daily News
Sweden is now trying to find a way to protect animals since bestiality has been legal since gay rights in 1944.
Sweden urged to ban animals sex after newspaper expose on bestiality
“Should a human be allowed to affectionately stroke the teats of a female dog?" asked Eskil Erlandsson, the Agriculture minister, explaining the complexities of an anti-bestiality law, "or does that count as the sexual abuse of an animal?" The minister, famed for his outspoken manner, left many Swedes aghast when he gave an even more explicit example. “What is, what would be, the legal position of someone who spreads an attractive-smelling substance on his sexual parts to encourage a dog to lick it off?"
The Minister's concern was stirred by figures and projections from animal welfare groups. One, the Swedish Animal Welfare Agency, registered 115 cases of bestiality between 2000 and 2005. This is regarded however as the tip of the iceberg and some published projections suggest that between 200 and 300 dogs and cats a year are being sexually assaulted.
The Expressen story has stoked up the debate even more. It infiltrated a reporters into a group run by the organiser of a flourishing internet animal sex forum. He owns a farm with dogs and horses and told the newspaper that he had regular sex with his female dog but only when she was on heat: "She was the one who backed into me and provoked it." This is a sufficient defence under current Swedish laws to prevent prosecution under charges of animal cruelty.
Once we have acceptance that homosexuality is normal, anything is possible and will be.