Looking to do the deed with that hot alien, demon, or super-assassin, but not sure about the risks? We list scifi's deadliest sexual encounters to ensure that your next orgasm won't be your last.
Assassinated in the Act
The Jennifer Morgue by Charles Stross: Some people have a monkey on their back; Ramona Random has a succubus. If Ramona doesn't have sex, the demon gnaws at her mind. If she does have sex, it devours her partner. It makes her questionable girlfriend material, but a highly effective assassin.
Goldeneye: Bond henchwomen often use their seductive powers to get what they want, and what Xenia Onatopp wants is a good orgasm. Unfortunately for her partners, she nothing brings Xenia to ecstasy quite like squeezing a man to death between her powerful gams.
Worshipping the Queen of Sheba (American Gods by Neil Gaiman): Bilquis, an incarnation of the Queen of Sheba, doesn't get loving any more from the worshippers who once prayed to her and held sexy fertility rites in her temples. So she maintains her power the best way she knows how: by posing as a prostitute, having sex with her johns, and promptly devouring them with her vagina. Judging by the screams of ecstasy, it's not an entirely unpleasant way to go.
Getting it on with Alien-Possessed Women
Torchwood "Day One": Cardiff is ground zero for alien mischief, so when a beautiful woman leads you into the bathroom for some anonymous love, stay on your toes. She might have a fetish for sexy time in the stalls, but she might also be possessed by an alien gas that wants to suck the sperm – and all the energy – from your body.
The Outer Limits "Caught in the Act": Chaste Hannah wants to wait until marriage before going all the way with her boyfriend Jay. When an alien lifeform takes control of Hannah's body, premarital abstinence flies quickly out the window as she starts seducing every man on campus. But this isn't sexual liberation; it's a hunger for man-meat that goes way beyond genitalia. When Jay starts tailing his suddenly unfaithful love, he discovers that she's absorbing men into her body during the act.
Death by Snoo Snoo (Futurama "Amazon Women in the Mood"): After all the men died out on Amazonia, the Amazon women devised a method of punishing male trespassers that fulfills the needs of the hetero sex-starved population: Snoo Snoo. Evidently, dying of a crushed pelvis only sounds like fun.
Alien Sex Vampires
Liquid Sky: The aliens who land on the roof of artist Margaret's loft find human endorphins especially tasty. Initially, they're content to nibble on the endorphins released during heroin use, but they quickly learn that the orgasmic variety is far more satisfying. So they start murdering Margaret's partners at the height of their sexual pleasure, leaving Margaret behind to deliver avant-garde monologues in her neon makeup.
Lifeforce: When a beautiful naked woman found imprisoned in the tale of Hailey's Comet crawls on top of you and starts kissing you wildly, it's probably not because she thinks you're neat. It's much more likely that she's searching for a convenient orifice through which to suck out your soul, leaving you a desiccated, undead ghoul.
Angel "Lonely Hearts": Angel & Co. hunt down a demon that kills its host when close to another naked body. But it's not looking to snag its host's energy; it's just leaping from body to body during sex, looking for the perfect body to inhabit forever.
Having Sex with Your Proxy Self (Kaiba): In a future where memories can be stored, traded, and implanted in someone else, having sex with someone who shares your memories can be a form of near-masturbation. But the experience is so intense that it can make your head (and the rest of your body) explode.
Death by Rapid Pregnancy
Fringe "The Same Old Story": When you're a human specially designed for rapid aging, and your sperm is similarly designed, it's best to use protection when sleeping with a fertile female partner. But even condoms fail from time to time, and those rapidly gestating pregnancies tend to kill the mother.
Species II: The same rules apply to men infected with alien DNA. Female alien hybrids can handle nine months' worth of pregnancy occurring in the span of a few minutes. Female humans just don't have the wombs for it.
Magically Boinked to Death
Dresden Files: Storm Front by Jim Butcher: When Harry Dresden is sent to investigate a pair of lovers whose hearts exploded in the act, he comes across a wizard who draws his energy from sex and lust. The wizard sent his target a coital heart attack, and her unfortunate partner got his own dose of cardiac overload.
Buffy the Vampire Slayer "Where the Wild Things Are": Buffy and Riley's repeated and enthusiastic lovemaking literally wakes the dead, freeing a crew of sexually repressed poltergeists. Once freed, the poltergeists try to ensure that they'll have a steady supply of sexual energy by getting Buffy and Riley to continue their round-the-clock shtupping until they die of exhaustion. Fortunately, the rest of the Scoobies come to the rescue with a spell to pry the lovers apart, at least temporarily.
Kryptonite Condom (Wanted by Mark Millar): Perhaps taking a cue from Mallrats' speculation on how Clark Kent and Lois Lane might copulate, supervillain Professor Seltzer once devised a kryptonite condom to take down his own Superman-like nemesis. Apparently, the hero's girlfriend never quite got the radioactive rubber on him, leaving us to wonder whether a kryptonite diaphragm would have been more effective.
The Classic Coital Coronary
Star Trek: New Frontier: Vulcans are known for their remarkable stoicism, which breaks down spectacularly every seven years during an individual's pon farr, during which a maddened Vulcan must mate or perish. But not every Vulcan has the constitution for the intense consummation. The Vulcan Voltak had a heart attack while between the sheets with his new wife, Enterprise Dr. Selar, leaving Selar widowed and throwing off her pon farr cycle.
Star Trek: Deep Space Nine "Let He Who Is Without Sin…": Curzon was a great diplomat and a notorious womanizer. So it's apt that he irreparably strained himself with attempting the sexual ritual of jamaharon on the pleasure planet of Risa, although he didn't give up the ghost (or, in this case, the symbiont) until several days later.
The X-Files "Gender Bender": The alien Kindred lead a life of quiet isolation in a rural Massachusetts community. But when one of the Kindred ventures into the outside world, their intense alien pheromones both attract a constant stream of willing partners and give them coronaries in the throes of passion.
The Tick "The Funeral": Many superheroes hope to go out in a blaze of glory, felled by some worthy opponent. Famed superhero the Immortal meets his fate on a mattress in Captain Liberty's apartment, felled by her vagina. Although judging from the pending paternity suits, he died pretty much how he lived.
Powers "Little Deaths": Philandering superhero Olympia has a similar exit, albeit accompanied by a literal blaze of glory. His alter ego's wife commits suicide over the ensuing tabloid coverage, but the woman who was on top of him at the time gets half a million dollars for the TV movie rights.