"Don Browning and Elizabeth Marquardt's essay in The Meaning of Marriage offers some "liberal cautions on same-sex marriage."
In the discussion of sex, it is normal now for liberals to automatically translate that term into "gender." The prevailing liberal theory is that no feature of masculinity or femininity is rooted in the biology of men and women. Everything is a social construction.
Everything, that is, except sexual orientation.
Read the rest at William Weston's Gruntled Center blog.