I'm about to order a Heath Stone Glass bowl, and I am trying to decide between one with a male or female joint. The reason I'd want the female joint is so I can stick it on the other half of my nail/dome oil rig, to save all of the oil and residue in the same glass piece. So basically my question is... Does the Health Stone give off the same oil/residue as a nail/dome setup? If not, then I'd want to get the male joint so it won't get the nail/dome setup dirty as the oil scraped from the rig seems to be no different from fresh oil.