The Red Pill says is clearly: women want good genes and good resources. This means that men with good genes have the opportunity for lots of sex, and men with good resources get strung along in sexless relationships, and men with neither good genes (looks) nor good resources (money/power) get nothing except shame.

High IQ means good genes.

Traditional marriage is illegal (“until death do us part” is legally unenforceable).

There a huge difference between illegal and not legally enforceable.