In nearly all states:
1) one man and one woman
2) both must be 18 or over (or have been given consent of a guardian)
3) neither can be currently married
4) neither can be closely blood-related.
So we're changing #1. Why not the others, and which "category" was I incorrect in again? BTW, "rights" are not the same as privileges. Privileges can be revoked. And I think I'll be just fine being on the "wrong" side of 10,000 years of history.