Just because vaginas get gynecologists and annual exams and all that jazz doesn't mean you can just forget about your penis health. In fact, there are a lot of problems that can arise if you don't look after your penis properly. So to find out more about how to keep your penis as healthy as possible, BuzzFeed Health spoke with two board-certified urologists: Dr. Here are some common mistakes, bad habits, poor hygiene practices, and behaviors they'd suggest ditching ASAP. New bumps, rashes, blisters, warts, or discoloration on the penis should never be ignored, especially if they're red or painful or itchy. This could be a sign of a sexually transmitted disease, a bacterial or fungal infection, an allergy, or something else, so you should get it checked out ASAP. Even if it turns out to be nothing, it's better to be safe than sorry. Plus, the penis and surrounding area can get pretty warm and sweaty, which makes it easy for bacteria and fungus to grow. Not to mention, the buildup of bacteria down there can also cause an unpleasant odor, Fisch says, and smelling bad is never fun.
The term penis applies to many intromittent organs , but not to all; for example the intromittent organ of most cephalopoda is the hectocotylus , a specialized arm, and male spiders use their pedipalps. Even within the Vertebrata there are morphological variants with specific terminology, such as hemipenes. In most species of animals in which there is an organ that might reasonably be described as a penis, it has no major function other than intromission, or at least conveying the sperm to the female, but in the placental mammals the penis bears the distal part of the urethra , which discharges both urine during urination and semen during copulation. Most male birds e. Among bird species with a penis are paleognathes tinamous and ratites  and Anatidae ducks, geese and swans. While most male birds have no external genitalia, male waterfowl Anatidae have a phallus. Most birds mate with the males balancing on top of the females and touching cloacas in a "cloacal kiss"; this makes forceful insemination very difficult. The phallus that male waterfowl have evolved everts out of their bodies in a clockwise coil and aids in inseminating females without their cooperation. These structures make it harder for males to achieve intromission.
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