You can improve adding choosing sexual orientation and adding more types of personalities to have a variety in the game. And one civic can be the liberty of same sex marriage.

What's neat is there is in fact already an "Event Choice" regarding same-sex marriage (Liberty vs. Tradition), and a few others, too.

https://www.games2gether.com/amplitude-studios/humankind/forums/168-general/threads/49084-does-anyone-know-the-conditions-to-trigger-these-events