Its a very sensitive portrayal of life with unquenched or constrained desires. What does one do with desire in a culture and society with rigid norms? One husband finds outlet with the immigrant - since immigrants don't belong or aren't accepted, they don't need to conform and dam their desires. The other husband looks for solace in spirituality and tries to evaporate his desire into nothingness. It fails - of course - and he breaks down in the last scene for multiple reasons. Sita still cared enough for him to find that moment to let him know that he is not responsible for her deviant outlet to her blocked desires. The mother in her still couldn't find the strength to destroy his myth. She sees him as a child who is glorifying himself in his lust-control but should she give him the opportunity to finally grow up? Both the wives find courage and togetherness through their shared rejection by their husband.

But the final act of rejection was by the grandmother - she could not break free from her rusted mindset to accept Sita's desire. A decade and more of receiving care was not enough to break the shackles of her culture.

Seems like it was easiest for the househelp to let his desires flow - since he's anyway damned by his culture - being at the bottom of the hierarchy. Since there is anyway no respect and expectations, might as well taste sin.