But what's the evidence from Scandinavia?

You'll be relieved to know that, according to an unofficial count compiled by the Sacramento Bee, opposite-sex marriages in California contain equal numbers of men and women:

Based on a tally of the licenses Thursday -- using first names as a guide -- 60 percent of the same-sex newlyweds this week are lesbians and 40 percent are gay men. Among heterosexual couples -- to no one's surprise -- the gender breakdown is 50-50.

(Thanks to David Link for the pointer.)