Polyamory/Triads/3somes in mythology

[anassa_anemou]

Hi.

I'm juggling plots to start a story, so I don't have a specific/rigid line
for where to go.

I have a big category: alternative relationships, with a big restriction: must be in a mythology.

I need a myth that has a alternative romantic link *non hetero-normative two person act*.

That is broad, I know. It's a starting place for me, since I want to take the myth and research around the people/the mythology/the culture and then the time,etc.

Google search: triads myths, mythology artenative relationships, 3some mythology, infidelity/voyerism mythology, non-convecional myths

*I also need help with search terms*