My point is why are 2 committed adults worried about getting approval or certified to be committed together, as if they only want to remain together because the government says they can, otherwise they will break up because there are no legal ramifications of a gay divorce. 2 people decide to be committed to each other with or without certification, it doesn't matter what other people in society think. While I don't want to see anyone or couple face harassment because they are living in sin or having children out of wedlock, I think people no longer view a marriage certificate as essential towards validating their monogamous relationship.
That's an argument against marriage in general, not just gay marriage.
I might be wrong, but I think HIV is more prevalent in the gay male community than in the straight community. I don't know the percentage of condom use among the gay community or rate of promiscuouity.
But what does the spread of STDs have to do with gay marriage? Are you suggesting that allowing gay people to marry will
increase the spread of disease? If not, what is the relevance of this line of argument?