Two Buttons

Well it's easy when you're a bisexual female: just get a boyfriend and say yes when he asks for a threesome with another girl.

Polygamy?

Eh, kinda. There's consent, so no feelings get hurt.

Well how bout three ladies so when she want a woman he can have one

I meant it as it just being a one-time thing in the relationship.

But what if she wants both all the time

Then that wouldn't be very fair.

Well that's why there is a third girl that can be shared