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An asstronaut is a slang term that refers to a man who sexually explores the erotic regions of the anus. It is originally associated with gay men and gay sex. However, it has crossed over into the realms of heterosexual sex. Its usage can be inoffensive when done among friends. However, some people may take offense so it's important to consider the context.
An asstronaut is into anal sex, which comes with inherent risks. Unprotected anal sex can spread infection and other sexually transmitted diseases. Rough anal sex can lead to tears and ruptures, which have further medical consequences. An asstronaut needs to be protected and careful in his anal exploration. A condom is a must. Being sensitive to one's partner also goes a long way.