No matter what a condom is made of, how it's disposed plays a role in its rate of decomposition. Flushing them can clog your plumbing, and also causes condoms to biodegrade much more slowly because they are isolated from sun, bacteria, and other environmental factors that speed decomposition. Plus, if they're flushed and mixed in with sewage, they might end up in the ocean; an article by the environmental nonprofit Worldwatch Institute notes that, during a 2009 international coastal cleanup initiative, volunteers removed over 26,000 condoms worldwide. When they're in the ocean, condoms can cause problems for marine life, especially if they're ingested. The best method, sources say, is to wrap a used condom in paper and leave it at peace in your garbage can, ready for its final resting place, probably a landfill.