Not saying bureaucratic polyamory of primaries and secondaries is the way either. Free agency is the ticket.

People don't need to be monogamous anymore. They plan things based on the desire to be, but then end up miserable because, again, it's no longer based on inevitability.

The standard line is that men are the ones bored by the monogamy prison, but it's not just men:

The Bored Sex

Women, more than men, tend to feel stultified by long-term exclusivity—despite having been taught that they were designed for it.

There are so many stats and anecdotes that women put forth regarding "husband as additional child", etc., yet even happy women cheat (headline is gender neutral but all the examples are women)

In short, monogamy is fuckin boring, and it's no longer a requirement. Single women are happier than married women, etc.

Break those chains