The husband in Brick Lane was obese but not morbidly obese. Maybe his wife was acrobaticand slim enough to do most of the work? It has been a while since I have seen Brick Lane and I don't recall a sex scene between the husband and the wife only between the wife and her young lover.
It's the first in the film, quite early on, no passion type scene. He mounts, she rolls her eyes and lets him get on with it.
I would say he was a larger fellow, though not obese. I've seen bigger men... and I've seen bigger women. And thanks to people forgetting to lock the school's door I've seen them having big fat naked sex.
The only thing that disturbed me was that I knew the place was filthy
