The Bath Sponge, like all other sponges live on the ocean floor. They are from the Phylum Porifera which literally means "pore bearing". The Bath Sponge Reproduces the same way as all other sponges. Either asexually through budding or sexually when one sponge releases it's sperm into the water and the other sponge collects it and fertilizes. Then it produces a larvae which floats around until it attaches on to a solid and then starts growing.