Sex position advice?

So I'm 5'7 and my bf is 5'10. He is average weight and has some meat on him but isn't too skinny, I'm larger though, I'm 240 and most of my weight is in my stomach and thighs. We usually just do missionary and I ride him sometimes. But we both want to spice it up a bit and we don't know how. And I don't know if this helps with advice but he is around 8 inches down there so size has never been an issue