Its the reason marriage exists in the first place. There are two sexes, that have sex, and babies are conceived. Otherwise, why would it mattered who married who, or didn't marry who. Why bar blood relatives from marrying? Beeeeeeeeecuz they might have SEX, and a baby might result.<quoted text>
To them, marriage is all about sex
It sure isnt to me... she means a lot more to me than that.
The more I think about it their marriages are a lot more fragile if sex is all it is about for them.
If SSSB is acceptable, SSM is legal, same sex first cousins can marry (in a state where both SSM and FCM is legal), why then should same sex siblings be prohibited from marrying?