You don't seem to understand, Catsize, I don't think same sex marriage in this country is a big achievement.
We've had civil partnerships which gave most of the rights of marriage anyway, people informally call people in cp's 'married' as it stands: all that's really changed is the nomenclature.
As Philip Hensher pointed out, 'Against gay marriage? We've got it already'.
May I point out to you that you are being ignorant as regards the civil partnership issue?
Let me be clear: there is no mention of adultery at all in a civil partnership; the concept of adultery (specific definition of penis in vagina sexual intercourse) does not exist in a civil partnership. Only unreasonable behaviour can be used as reason to dissolve a cp if the other partner has sexual relations with another person. And it makes no difference what gender the unfaithful person strayed with.
For somebody who is writing an essay on this, you really ought to know that.
So it doesn't matter what a person's sexual orientation is in a civil partnership, they can't cite adultery anyway! They can only say 'I want to dissolve this civil partnerships owing to the fact that my partner has had sex with another adult' (the gender of that other person is irrelevant).
I am talking about same sex marriage and saying that the specific concept of adultery -being penis in vagina sex- is hardly likely to be of use to the majority of same sex couples who will usually be purely homosexual. Just as the majority of opposite sex couples are purely heterosexual.