Surely you're not so foolish as to imagine that you could strip all gender implications from the marriage law, without affecting husband-wife couples.
Sure you could and no, it won't affect opposite-sex couples. If it doesn't matter legally what gender/s a couple have, then it doesn't matter legally what gender/s a couple have. End of story.
Under the presumption of paternity, if a wife gets pregnant, and says that it's the husband's baby, and the husband doesn't question it, then no outsider is allowed to haul them into court and say \"I fathered that child, son give me custody.\" [...] Pray tell, how should this work for a female-female couple, to make them \"equal\" under the law? How does it work for a male-male couple, to make them \"equal under the law?
The same as for a male-female couple, of course: if one gets pregnant, the other is presumed parent as well. Sure, I'm no lawyer, but it seems fairly obvious to me.
We have no laws for annulments of marriages in Sweden. The only way to get out of a marriage is divorce. Sure, we have almost equally strong cohabit laws as marriage laws, so you can live together for a few years until you are really sure you fit together and then get married.
You ought to discuss your expectations with your future wife/husband before you marry. If you want to have kids, shouldn't you to say that before you marry? The same if you don't want to have kids, or if sex is very important to you, or not important at all.
If you don't have sex with your spouse until after the marriage, and then find that you don't like it, you have only yourself to blame.