Straight couples don't have to be monogamous to be married or married to be monogamous. Monogamy no more defines marriage than the presence of children does. Monogamy isn't compulsory and its absence doesn't invalidate a marriage. ↗
I studied with a blind teacher from about 5 until I was 16, at two different schools. From the age of 12 until 16, I was in a boarding school-which, I believe, at that time was compulsory for blind children. ↗
Lesbian existence comprises both the breaking of a taboo and the rejection of a compulsory way of life. It is also a direct or indirect attack on the male right of access to women. ↗