Do you and your partner have a go-to position or do you mix it up?

Genuinely asking because my girlfriend and I realized we basically rotate between the same three and we've been meaning to branch out. This site has a ridiculous amount of positions and I didn't even know half of them existed.

Are most people creatures of habit or do you actively try new stuff? And if you do try new things, how do you bring it up without it being weird?