Basic Trope: Somebody has sex with a duplicate of themselves.
- Straight: Through Time Travel, Alternate Universe, cloning, magic, or some other form of plot device, Alice meets another Alice and has sex with her.
- Exaggerated:
- Alice has Three-Way Sex with two other Alices.
- Alice has a long-lasting relationship with her counterpart, and even has a kid.
- Alice is a Hive Mind possessing multiple bodies which all engage in group sex.
- Downplayed:
- Alice masturbates while thinking of doing it with herself.
- Two Alices have sex with a non-Alice third party.
- Alice is a voiceover actress for a cartoon series who complains about a script involving her (not blood-related) characters Bob and Bobbi to fall in love, and refuses to do it because it's way too much like this trope invoked.
- Justified:
- Alice is incredibly narcissistic.
- Alice is gay or bisexual, very attractive and Other Alice is different enough in personality to genuinely fall for.
- Alice had been working out and accessorizing to be the perfect girl she would want. Seeing the same body and jewlery on another felt like it was just as good.
- Alice's pheromone is stronger than normal people. While she gleefully uses that fact to exploit others, she gets her comeuppance when her alternate-dimension counterpart shows up.
- Inverted:
- Alice has sex with Bob and Bob's clone.
- Alice has sex with Alexei, her Opposite-Sex Clone.
- Alice has a lot of self-loathing, so vigorously hates her alternate self and tries to kill her.
- Subverted:
- Alice seems to be in bed with herself... but it turns out to be her identical twin, Carol.
- Alice is Wrong Genre Savvy. She is also a fan of this trope. When she meets a woman who looks exactly like her, she assumes this trope is happening, and that this woman is herself from either another time or other dimension. Alice flirts with her, and purposely doesn't ask about her past—she doesn't want to put herself in an awkward position and make her explain inter-dimensional travel. They have sex. But Alice soon learns that she is in a very different kind of story, and this mysterious woman is actually her long lost twin sister.
- Alice meets her duplicate, Other Alice, and they seem to get along swimmingly at first, and might even flirt a bit... But then Alice and Other Alice eventually come to discover they both also share exact the same personal flaws and insecurities, which triggers their mutual self-loathing and eventually they start bickering and arguing with each other nearly constantly to the point where they cannot stand being in the same room together. Essentially, they are Too Much Alike taken to its logical conclusion.
- Double Subverted: ...but then we find out that Carol actually is Alice's other self, brought back for another dimension. Here, Alice just calls her other self Carol and says she's her twin to avoid lengthy explanations.
- Parodied: Alice creates all kind of clones of herself, from loli-type to Onee-sama-type to Bifauxnen-type to Fetishized Abuser-type (etc), just to have fifty shades of her own flavor.
- Alice is such a Casanova Wannabe that even her clone rejects her.
- Zig-Zagged: Alice goes into a parallel dimension, and meets someone offscreen, who takes her to their place… which happens to have the same address as her house in her own dimension. The next morning, she is shown leaving and being kissed goodbye by a man. He is called Alex, and has had gender reassignment surgery. He looks nothing like her. His hair is dyed, and if it wasn't he would look suspiciously like her.
- Averted: Nobody travels between dimensions, or considers sexual relations with an alternate version of themselves.
- Enforced: "We have already established Alice as a narcissist who is only in love with herself, how can we take it a step further?"
- Lampshaded: A time travel agency warns its customers that your other selves may have STDs that your present self does not.
- Invoked: Alice builds and uses a machine to travel to a parallel dimension for this explicit purpose.
- Exploited: Alice whores herself to her alternate dimension counterparts, because she wants things they have which she don't. And they are divergent enough that she can rely on this method to solve each and every one of her problems.
- Defied:
- Alice hits on her counterpart—who isn't keen on the idea.
- Alice's parallel dimension counterpart hits on her. She isn't keen on the idea.
- To prevent genetic pollution, inter-dimensional law makes it illegal for one to screw oneself. The punishment starts with death, and it only gets harsher from there.
- Discussed: "Try not to meet yourself when you go back in time." "Why? Worried that I'll fall in love with myself?"
- Conversed: "So does that make Alice a narcissist or something?" "Nope, it makes her smart. Who knows your way around your body better than you yourself? If I had that opportunity, I wouldn't miss it."
- Implied: Alice travels to another dimension. She goes off on her own for a little, then returns Sex Dressed. Bob asks what happened, and Alice says, "I think I just met my other self." There is no further explanation.
- Deconstructed:
- Alice falls in love with her parallel dimension counterpart, and when her interdimensional transporter is destroyed, she decides she cannot love anybody but herself. And the only sex she ever gets (or enjoys) is masturbation.
- She's only fallen for her parallel self because she's unable to form relationships with anyone else.
- Reconstructed: When her interdimensional transporter is destroyed, Alice puts all her time and effort into repairing it so she can resume her relationship with herself, while occasionally enjoying masturbating and wishing it was her other self. Their reunion is very... passionate.
- Played for Laughs: The two Alices look each other in the eye, run into each other's arms, and passionately kiss. They break apart simultaneously and ask each other in unison, "Am I really such a horny desperado?" Then break out in unified laughter and go right ahead. Coitus ensues.
- Played for Drama:
- Alice's parallel dimension counterpart is a man. They have sex. Alice gets pregnant, and everyone wonders to whom. To make matters worse, when it's born everyone wants to know why the female child looks exactly like Alice. And she has to explain to them. As well as the child later in its life.
- Alice has a serious self-esteem issues, and is a huge jerk to boot. One thing and another lead to her meeting her alternate-dimension counterpart, which is the only one in the entire multiverse who will say "But Your Wings Are Beautiful" (and vice versa). They eventually get over their self-esteem issues together, and the story ends with their marriage. The whole thing plays like a cliched romance novel.
"And you, Miss Alice, can go back to Screwing Yourself!"
