'''Basic Trope''': A character has more than one relationship at a time.
* '''Straight''': Alice and Bob and Charlie are all openly dating each other.
* '''Exaggerated''':
** Alice and Bob are married to or dating a dozen other people. They have a ridiculously large number of these marriages.
** Everyone in the work, even the background characters and the characters that only appear once, are involved in one huge relationship.
* '''Downplayed''':
** Alice and Bob are described as being in or agreeing to an open relationship, but none of their other lovers are ever seen.
** Alice is dating multiple people, but said people aren't dating each other.
** Alice and Bob are in a committed marriage while allowing each to have hookups outside it.
** A group of couples are openly affectionate around each other up to including sex.
* '''Justified''':
** Alice, Bob, and Charlie live in a time or place where (for largely pragmatic reasons) this is the norm.
** Neither Alice nor Bob get jealous easily, playing on the more positive end of IWantMyBelovedToBeHappy mentally, and so don't mind if the other has another relationship.
** They're all in love with each other, like that sort of thing and in the FreeLoveFuture setting, that's okay.
* '''Inverted''':
** Alternatively, Alice and Bob are involved with other people as well as each other, but without any prior agreement. Someone is cheating, in other words.
** Alice, Bob, and Charlie have [[NoHuggingNoKissing no romantic relationships]].
* '''Subverted''': Alice and Bob seem like they're dating Charlie, but it turns out they're not, and it was just ThreesomeSubtext.
* '''Double Subverted''': But they they later ''do'' get together with Charlie--their ThreesomeSubtext was {{UST}} leading up to a RelationshipUpgrade.
* '''Parodied''':
** Alice and Bob have a mass marriage to all their partners. They even end up getting married with a bunch of people they didn't even know, yet they roll along with it just fine!
** Wedding bells are heard every second of the day, even at midnight.
* '''Zig Zagged''': Alice, Bob, and Charlie were poly, then Alice and Bob became monogamous. And then Bob cheats on Alice with Diane. And Diane is in relationship with Charlie, and they're polyamorous. Bob and Charlie met again through Diane, fall back in love, and Bob ultimately leaves Alice for Charlie and Diane. Until they find out Charlie was cheating on this them whole time... ''with Alice'', and they all break up. Except for Alice and Charlie, who stay together monogamously.
* '''Averted''': [[NoHuggingNoKissing The work features no dating at all.]]
* '''Enforced''': The TV show is being funded by a polyamorous organization specifically to depict a polyamorous relationship.
* '''Lampshaded''':
-->"S--so, the three of them are--"\\
"Dating each other? Yep."\\
"That's… unorthodox…"
* '''Invoked''': Alice, Bob and Charlie are in a LoveTriangle, and this is how they decide to resolve it. They do this as soon as they realize their situation, because they know [[MurderTheHypotenuse being in a Love Triangle is dangerous]].
* '''Defied''': Alice and Bob agree to be romantically and sexually involved with only each other.
* '''Discussed''': "Y'know, I'm actually kinda happy they decided to go open. Think, I could try scoring with ''both'' of them now if I wanted."
* '''Conversed''': "I'm so glad they're all dating now--I hate those LoveTriangle stories."
* '''Implied''': ThreesomeSubtext
* '''Deconstructed''': While there are advantages to multi-partner relationships, there are also disadvantages. The primary ones being the GreenEyedMonster and favoritism. Not to mention the issue of a culture that regards this setup as "wrong" or "deviant." There may also be an increased risk of sexually transmitted diseases.
* '''Reconstructed''': Everyone agrees to take the appropriate health precautions. They're careful to give equal attention and affection to all their partners, so no one feels slighted. If someone ''does'' get jealous, they will step back, realize that they are loved, and channel that jealousy into something constructive. Those naysayers that tell Alice, Bob, and Charlie that this can't/doesn't/shouldn't work are proven wrong and ThePowerOfLove triumphs.
* '''Played For Laughs''': UnwantedHarem
* '''Played For Drama''': Jealousy ensues, and things start getting [[MurderTheHypotenuse REALLY ugly]], [[DiabolusExMachina REALLY fast]].
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