Right?

Here’s what I don’t get: in order to be married you have to be a) not already married, b) over 18, c) of sound mind, and not related to the proposed partner. NO WHERE does it say you have to love that person, or live with that person, or want to be intimate with that person , or frankly, even KNOW that person. I can marry some random person from the opposite sex that I’ve never met, but I can’t marry my best friend from childhood that has cancer and needs my insurance just because they are the same sex as me? How is that NOT discrimination based on sex?