Straight couples do is not yucky, it's acceptable in public. What gays want to do is yucky, especially in public and I don't want to have my kids subjected to repulsive behavior.
What you state is New-Age gobly goo.
Two guys making out is yucky. Two girls making out is the opposite of yucky. So it all averages out the same as a guy making out with a girl. I'll tell you what's yucky: Eating the body and blood of someone who died 2000 years ago. I don't want any children of mine exposed to people who get off on doing that.
In all seriousness, whether you think its yucky or you think its wrong according to your religion, the first amendment is supposed to guarantee that religious laws aren't enforced on the general population who may not share the same religious values. And the fourteenth amendment is supposed to guarantee that laws treat all people equally. Any law restricting men from marrying men or women from marrying women is almost certainly a religious-based law, and should be found unconstitutional based on the 1st amendment, and those laws phrased carefully enough to not violate the 1st amendment will all violate the 14th amendment.
I for one would support a constitutional amendment saying its illegal for the government to give special privileges to those who are married, or to perform marriage ceremonies. Instead the government should certify civil unions between two adult humans of any gender. In order to not make thousands of laws become unconstitutional over night, a grandfather clause should be written in saying all laws that specify "marriage" prior to the passing of the amendment should be assumed to mean "marriage or civil union" afterwards. Going forwards all laws would be required to specify "civil unions" instead of marriage, and people who used to get a marriage certificate from the government will henceforth get a "civil union" certificate.
This law / amendment would delegate the responsibility to religion to take care of the religious matter of marriage. The government would wash its hand of one more religious responsibility, which is a good thing.