Are there certain positions that you just can't do because of your anatomy or that of your partner's?

My wife and I are overweight folks. I have quite the gut, and she has a rather large booty. My gut on her trunk prevents any doggy style action. And it gets worse when she wants to be on top, my claustrophobia kicks in and I panic so bad I lose the erection.

We're about the same height. She's plus size, and I'm slim-ish. There are no positions that we straight up can't do, but there are limitations. Our similar height actually makes sex standing up pretty easy.

For PIV sex, I need to be aware of my angle so I don't ding her cervix. She also needs to be very turned on and lubed up before I can go in due to my girth. So no quickies unless she's really horny already (which is rare due to life stress).

We haven't done anal because of a very shit experience with her ex.

Receiving oral is good, but there's always the danger of teeth. There's no issue of my giving her oral.

Not that we can't do it. But missionary requires a pillow under her else the angle doesn't work very well.

We are the same height and can do everything, but standing and bent over I'm a little too tall (or he's a little too short) for it to be perfect fit. He's hung a little bigger than average not huge, I'm small/medium in everything but height, more bottom than top.

If you are trying to do standing in the shower, she may just not feel safe bending over enough. Does it work if she wears heels and bends over the bed?

ETA: I forgot oral - my mouth is so small the orthodontist had to pull teeth out to make the others fit, and husband is hung thick. It doesn't matter how careful I am, the back teeth are treacherously close together, my bite not as wide as his cock. So lots of hands involved when giving oral.