Basic Trope: Having sex = death of characters
- Straight: Alice and Bob have sex, and one or both die soon after, whether of STDs or something else.
- Exaggerated:
- Alice and Bob have sex, and one or both die during the sex act.
- If Alice or Bob so much as think about sex, they will die.
- Downplayed: Varies depending on what base you're in, like getting a bruise after a kiss to the lips or being in critical condition after a night of mutual masturbation.
- Justified:
- Alice or Bob have an STD that can be fatal.
- Alice and Bob were so distracted by the sex they didn't see the slasher coming.
- Alice and Bob are teenagers who Can't Get Away with Nuthin'.
- Alice and Bob are Starfish Aliens who are genetically programmed to die shortly after mating and laying eggs.
- Either one is a disturbed Vigilante Man using... unusual methods to entrap rapists, perverts and other sexual scum, which the other is.
- Bob is a male spider.
- Bob is a monster planting his seed. Alice's body can't withstand the unnatural nature of the pregnancy.
- Either Alice or Bob discover they are be allergic to sexual fluids, condom latex, or the additives/preservatives put into certain edible sex paraphernalia.
- The killer enjoys killing people during the afterglow of sex.
- Inverted:
- Alice and Bob are zombies who must have sex in order to come back to life.
- Alice and Bob will die of UST if they do not have sex.
- The slasher kills all the virgins, but the sexually active Battle Couple defeat him.
- Alice and Bob realize that they're about to die, and so they decide to go Out with a Bang. This is Sex By Death, because it is the approach of death that causes the sex.
- Bob walks in on Emperor Evulz having sex with one of his concubines. Enraged by this, Evulz attempts to murder Bob.
- The slasher is unaware of Alice and Bob outside having sex in the car as he slaughters everyone in the house. As a result, Alice and Bob are the sole survivors of the massacre.
- Alice kills Bob; for resisting her seductions attempt.
- The slasher has a Weaksauce Weakness of crippling coitophobia - having sex in front of him is ironically the best way to survive and scare him off.
- Mate or Die
- Subverted: Alice and Bob have sex. However, it's Charlie who winds up getting killed.
- Double Subverted:
- Alice has a fatal STD and gives it to Bob through sex. However Bob dies by some cause completely unrelated to the disease.
- Alice has a fatal STD and subsequent to them sleeping together, it is revealed that Bob has caught this disease. Later, it is revealed that he already had the disease when he slept with Alice, meaning that the focal sex scene didn't kill him at all.
- Parodied:
- The slasher walks the Earth, and only goes after couples having sex. Only when they're having sex. He backs off during false alarms.
- Alice and Bob die from having G-Rated Sex.
- Zig Zagged: ???
- Averted:
- Alice and Bob do not die as a result of having sex.
- Alice and Bob do not have sex.
- Enforced:
- Alice and Bob are teenagers who Can't Get Away with Nuthin' for the sake of a Very Special Episode in a Teen Drama meant to Scare 'Em Straight.
- An abstinence-only sex-ed class meant to Scare 'Em Straight.
- A Slasher Movie relying on some old cliches.
- Lampshaded: "Did you just dare to have sex? YOU WHORE!!! DIE!!!"
- Invoked:
- Alice's Boyfriend-Blocking Dad finds out about Bob screwing his daughter and heads over to Bob's house with his weapon of choice.
- Alice and Bob are Mauve Shirts preparing to make a More Hero than Thou Heroic Sacrifice who decide that Must Not Die a Virgin
- Alice's cultural position (perhaps simply being a woman) requires her to remain a virgin. After it's discovered she's no longer a virgin, her overlord has no further use for her and executes her.
- After having sex, Alice and Bob discover that they are long lost brother and sister. Unable to handle the ick of what they'd previously done, one or both of them commit suicide in shame.
- Exploited: Alice and Bob have sex for the explicit purpose of luring the killer into a trap.
- Defied: The slasher sees Alice and Bob in an act of Auto Erotica... And goes off to slash someone else, maybe due to some kind of standard, or because he felt sympathy for the couple's sincere display of affection.
- Discussed: "Bob, I can't have sex with you. I like living way too much to do that."
- Conversed: "Have you ever noticed characters who live active sex lives always die in horror movies?"
- Deconstructed: Alice and Bob feel quite stressed and bad about consummating their relationship, fearing imminent death as a consequence. They die in very poor conditions, they're also revealed to have been in the act, making many people mad.
- Reconstructed: After finding and falling in / making love with each other, knowing they will die soon due to a disease or some curse being put on them, Alice and Bob decided to go out in the best physical event possible. During that time they both enjoy it for all it's worth, not being held back by anything or anyone, allowing them to go out in the best way possible.
- Played For Laughs: The slasher comes up and sees Alice and Bob in an act of Auto Erotica, rolls his eyes, and blatantly stands there waiting for them to finish.
- Implied: Alice is found dead with a man's shirt on.
- Unwtwisted: Alice and Bob survive, but only because Claire and Daniel also had much louder sex and where promptly killed by the slasher.
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