– S / M – sacred prostitution – Marquis de Sade – sadism – sadist – sadomasochism – sadomasochistic sacrifice – safe sex – safe, sane and consensual – safer sex – safeword – saliromania – salirophilia – salpingectomy – salpingitis – same-sex marriage – same-sex partnership – sanitary napkin – sanitary pad – sanitary towel – sanky-panky – sapphic – sapphism – saptha padhi – Sarcoptes scabiei – satan worship – satyr – satyriasis – saucy seaside postcard-sausage party – scabies – scarfing – scarification – scat – scatology – scatophilia – scene ( BDSM ) – scopophilia – scoptolagnia – scoptophilia – scratching ( sexology ) – Screw magazine – scrotal inflation – scrotal infusion – scrotal piercing – scrotal stretching – scrotum – scuba fetishism – second skin – secondary sex characteristic – secondary virginity – secret vice – secular law – seduction – see-through clothing – self-abuse – self-bondage – self-isolation – semen – semen allergy – semen swapping – semen-loss anxiety – semen-loss syndrome – semeniferous tubules – seminal colliculus – seminal plasma – seminal plasma hypersensitivity – seminal vesicle – seminiferous tubules – sensate focus – sensate focus exercises – sensate focusing – sensation play ( BDSM ) – sensory compensation – sensory deprivation – sensory enhancement – sensory overload – sensuality – separatist feminism – septa of testis – septum of the penis – seraglio – serendipitous – serial killing – serial monogamy – seronegative – seropositive – serosorting – serotonin – serous tumor – Sertoli cell – Sertoli-Leydig cell tumor – service-oriented – session wrestler – seven-year itch – sex – sex act – sex addict – sex addiction – sex adjunctive – sex adventitious – sex aid – sex allergy – sex assignment – sex boutique – sex change – sex chromatin – sex client – sex club – sex coaching – sex compulsion – sex cord-stromal tumor – sex crime – sex derivative – sex diet – sex doll – sex drive – sex education – sex flush – sex game – sex hormone – sex hormone binding globulin – sex hotel – sex hotline – sex industry-sex in space – sex irreducible – sex machine – sex magic – sex magick – sex manual – sex museum – sex nexus – sex object – sex of rearing – sex offender – sex parties – sex position – sex reassignment ( disambiguation ) – sex reassignment surgery – sex reassignment surgery female-to-male – sex reassignment surgery male-to-female – sex restaurant – sex ring – sex role – sex scandal – sex shop – sex show – sex steroid – sex strike – sex surrogate – sex symbol – sex tape – sex therapist – sex therapy – sex tourism – sex toy – sex traffic – sex trafficking – sex urge – sex with your ex – sex worker – sex-contact magazine – sex-determining system – sex-hormone therapy – sex-positive – sex-positive feminism – Sexaholics Anonymous – sexercise – sexism – sexless marriage – Sexmuseum – sexological education – sexologist – sexology – sexosophy – sexploitation – sexsomnia-sexting – sexual aberration – sexual abstinence – sexual abuse – sexual acronyms – sexual act – sexual activities – sexual addiction – sexual anatomy – sexual anomalies – sexual arousal – sexual assault – sexual attraction – sexual availability – Sexual Behavior in the Human Female – Sexual Behavior in the Human Male – sexual bondage – sexual characteristics ( disambiguation ) – sexual child abuse – sexual compulsion – Sexual Compulsives Anonymous – sexual confidence – sexual congress – sexual continence – sexual desire – sexual development – sexual deviancy -- sexual deviant – sexual deviation – sexual differentiation – sexual dimorphism – sexual dissatisfaction – sexual drive – sexual dysfunction – sexual equality – sexual ethics – sexual ethnology – sexual exploitation – sexual fantasy – sexual fetish – sexual fetishism – sexual fetishist – sexual fidelity – sexual flush – Sexual Freedom Coalition – sexual frequency – sexual frustration – sexual game – sexual harassment – sexual health – sexual health clinic – sexual history – sexual inadequacy – sexual identity – sexual intercourse – sexual intimacy – sexual inversion – sexual jealousy – sexual liberation – sexual lubricant – sexual malfunction – sexual maturation – sexual maturity – sexual medicine – sexual misconduct – sexual morality – sexual mores – sexual network – sexual norm – sexual orientation – Sexual orientation and Wicca – Sexual orientation change efforts – Sexual Identity Therapy – sexual outlet – sexual partner – sexual perversion – sexual perversity – sexual politics – sexual predator – sexual problem – sexual prop – sexual prowess – sexual reassignment surgery – sexual rehearsal play – sexual revolution – sexual ritual – sexual roleplaying – sexual sadism – sexual script – sexual slang – sexual slavery – sexual stimulation – sexual surrogate – sexual tension – sexual trophy – sexual violence – sexuality – sexuality education – sexuality in older age – Sexuality Information and Education Council of the United States – obsessive-compulsive disorder and sexuality – sexually active – sexually dimorphic nucleus – sexually transmissible disease – sexually transmitted disease – sexually violent predator – sexuoerotic – sexuoerotic tragedy – sexuoerotic body image fixation – sexuoeroticism – shaving ( sexology ) – shemale – shidduch – shim-pua marriage – shocker ( hand gesture ) – shoe dangling – shoe fetishism – shotacon – shotgun wedding – showers ( sexology ) – shunga – shyness – side entry missionary position – siderodromophilia – SIECUS – sigheh – significant other – Volkmar Sigusch – sildenafil citrate – Silver Ring Thing – Sin City ( description ) – sindoor – single – single mother – single parent – single status affidavit – singles bar – sinus ( disambiguation ) – sissy – sissy boy – sitophilia – situational child molester – situational sexual behaviour – sixty-nine – size queen – Skene's ducts – Skene's gland – Skene's glands – Skoptzy – slap and tickle-slapper – slapping ( BDSM ) – slave ( BDSM ) – sleep sex – sleeping princess syndrome – sleeping together – sleepsex – sling – sloppy seconds – slut – smegma – smoking fetishism – smotherbox – snapping pussy – snowballing – soapland – social distancing – social host liability-social vice – Society for Human Sexuality – Society for the Scientific Study of Sexuality – sociobiological theories of rape – sodomy – sodomy law – soft butch – soft chancre – softcore pornography – soggy biscuit – soiree-soixante-neuf – solicitation – soliciting – solitary vice – sologamy – solosexuality – somatic – somatotropin – somesthetic – somnophilia – sororal polygyny – sororate marriage – sounding – spandex fetishism – spanking – Spartan pederasty – spay – spectrophilia – speculum – speed dating – sperm – sperm bank – sperm competition – sperm count – sperm donation – sperm donor – sperm motility – sperm sample – spermatic cord – spermatic duct – spermatid – spermatidogenesis – spermatocele – spermatocyte – spermatocytogenesis – spermatogenesis – spermatogonium – spermatophobia – spermatophore – spermatorrhea – spermatozoa – spermatozoon – spermicide – spermiogenesis – sphincter – spinnbarkeit – spinster – spin the bottle-spiritual marriage – spiritual wifery – spit roast ( sex ) – spitting fetishism – splanchnic nerves – splash conception – split beaver – splitting – sploshing – spoiled orgasm – spongy urethra – spoons position – spousal abuse – spreadeagle – squashing of the deckchair position – squeeze technique – stag party – stalking – standing sex position – stapling ( sexology ) – statutory rape – STD – STD clinic – STD testing – steatopygia – stem pessary – stereocilia ( epididymis ) – sterility – human sterilization ( surgical procedure ) – steroid hormones – STI – stigmatic / eligibilic paraphilia – stigmatophilia – stimulus-response theory – Stockholm syndrome – stocking fetishism – Stonewall riots – stop and go exercises – stop-start technique – Marie Stopes – Story of O – strangling ( sexology ) – strangulation – strap-on dildo – Street Offences Act 1959 – street prostitution – streetwalker – stretching ( sexology ) – string bondage – strip poker – strip pub – strip search – stripping – stripping fetishism – striptease – stroma of ovary – stuffing ( fetish ) – stuffing ( sexology ) – subbing – subcutaneous tissue of penis – subfertility – subincision – sublimation – subliminal tape – submission – submission ( BDSM ) – submissive ( BDSM ) – subpersonality – succubus – sugar daddy – supernumerary nipple – support group – surface epithelial-stromal tumor – surgical fetishism – surrendered wife – surrogate mother – suspension – suspensory ligament of the ovary – suspensory ligament of the penis – suttee – suturing ( sexology ) – swara – swayamvara – sweetheart – sweetheart scam – swimsuit fetishism – swing ( sexology ) – swing club – swinger – swinging – swinging both ways – swish – switch ( BDSM ) – switch ( sexuality ) – sworn virgin – Swyer syndrome – Sybian – sympathetic nervous system – symphorophilia – symphysis pubis dysfunction – symptothermal method – synechial membrane – syphilis –