Narcissistic Masturbation
The act of having sex or doing sexual things with someone so similar to you, they could nearly be called a clone.
Andrew: Ah man i just slept with Jessica!
Dave: What?! She is exactly like you! You look and act like you could be the same person!
Andrew: I know, it was some serious Narcissistic Masturbation!
Dave: What?! She is exactly like you! You look and act like you could be the same person!
Andrew: I know, it was some serious Narcissistic Masturbation!