Best position for big girls

Okay so I need advice. I'm a big girl and my husband is average size (about 5 or 6 inches). I'm fairly certain Baby Got Back was basically written about me, which my husband is a fan of, but my butt and thighs get in the way for a lot of sex positions. For any big girls, what have you found to be the best sex position? We end up doing missionary a lot and I feel like he's going to get bored of the same thing all the time. I have tried being on top (when I was 30 lbs lighter, it worked VERY well), but at my current weight, it's rough because I'm not as flexible and my thighs are kind of in the way of me getting down on him right. I'm working on losing weight but until I am smaller, I just need some help figuring out other ways to keep things different and fun and interesting. Any thoughts or tips???