1. Against the behavior on biological grounds, (deviant from the norm of mammalian reproduction, unsanitary, and pathogenic); on religious grounds (an abomination before the Lord); and on personal grounds (just eww).
2. Tolerant toward the practitioners thereof (they will meet the Righteous Judge eventually, and shrieking "homophobe!" at Him will be ineffective).
3. I do wish they would be as loud and specific about the way they like their orgasms as I am about mine (that is, silent and indeed protective of that information).
4. Marriage is not a right. Not for homos, not for heteros, not for anyone. Millions who would like to marry cannot, and sometimes that's a lifelong situation. You have as much right to marry as you have to play professional polo. It can be done if you gain the qualifications, but most likely you'll be in an amateur league. Even that requires a rider and a horse; two riders can't play polo-- any more than two men can truly make a married couple.