Weird IFC Movie I saw around 2004/2005

I don’t remember much but I know it took place in the 1930s-1950s and the core plot was about a gang of amateur robbers. One scene stuck out in particular in which a disabled (possibly diabetic) guy was laying the grass, desperately needing insulin/medical attention. However, the horny woman that was with him pretty much rapes him. She gets on top of him and starts humping and moaning. The guy pulls out a gun and aims it at her and tells her to stop, but she keeps going. He says “I’ll shoot you” but I think she just laughs and continues. I know it sounds very weird but that’s all I can remember. ? It was a color film.

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