Describe symbolism in The Metamorphosis by Franz Kafka

The picture in Gregor's room is a symbol of his unfulfilled sexual desires. The picture is taken out of an illustrated magazine, this picture is in a gilded frame on the wall. It contains a house and a woman in a fur hat and boa, raising a fur muff.

... hanging conspicuously on the wall, which was otherwise bare already, the picture of the lady all dressed in furs, hurriedly crawled up on it and pressed himself against the glass, which gave a good surface to stick to and soothed his hot belly. (