Merriam-Webster defines sexual intercourse as:
noun, involving penetration of the vagtia by the penis.
Or, looking at the definition of coitus, by Merriam-Webster:
physical union of male and female genitalia accompanied by rhythmic movements.
And the definition of deviant, by Merriam-Webster is:
departing from some accepted standard of what is normal.
deviating especially from an accepted norm.
By the above definitions, homosexuality, beastiality, pedephilia, necrophilia, sodomy, cunnilignus (sp?), etc, etc, etc… are all deviant (abnormal) behaviors.
Now, some of them I personally agree with, however, we are not talking about what I agree with, we are referring to why the government (any government) has a moral and ethical duty to interfere with a non-deviant, socially acceptable status for no real benefit to one party and detriment to another party.
Now, I have no problem - per se - with a government dictating that you can get a civil union with anything you want, your dog, your son, your mother, your best friend of the same gender, your marble boulder at the end of your driveway, your white picket fence, whatever. I do not think anyone in the world really gives two hee-haws if the government allows this or not. What people care about is taking a historically, and typically religious term and applying it to these unions.
The only good solution to this problem, that is a win-win (in so much as gay people cannot sue a church because they refuse to perform the ceremony, or in that no one gets pissed off about it) is to require all parties interested in getting government recogonition of their sexual behavior to get a civil union and have no governmental benefits at all (including punishments) regarding marriage. This reserves the religious ceremony of marriage as the union of a man and a woman before God and before witnesses back in the hands of the church and only the church.
Point in history, the only real reason government was ever involved in the unions of man and woman was to foster a stable environment for the creation of future (biological) tax payers, laborers. If this was unnecessary, I dare say that no ancient time lord or king or town bully would have given a rat’s arse and we would never have had governmental influence on marriages. If we strip the role of government of fostering a stable environment to raise biological offspring, then government ceases to have any vested interest in the union at all and thus, should be completely removed from any such relationships (including managing divorces.)
PS: Let us remember that the recipient of sexual intercourse always takes damage. Vaginal/Anal tearing, emotional/mental damage (welcome or not.)