n. One who doppelbangs. One who continually has sex with similar or identical looking people.

Noun: A person that looks so much like your current boyfriend or girlfriend that it could not be considered cheating on them if you were to be caught (or not).

Someone that resembles your current or past relationship that you may have the urge to call them by the wrong name.

A person that looks so much like a celebrity, you may just get with them because of it.

Who you blame when caught cheating on your spouse/significant other.

A friend who has almost identical taste in sexual partners. Two people are doppelbangers if they share uncanny interest in multiple members of the opposite sex.

An exact double of ones self who bangs ( has sex with ) people who are not their significant other.

realizing after the fact that you've just had sex with someone you'd slept with before... a sexual doppelganger

An apparition or double of another living persons genitalia.