Naka-iki is Japanese slang for a female orgasm reached through vaginal stimulati…

Acme is a French-derived Japanese loanword for the instant sexual pleasure peaks…

Kougan is the testicle: the paired male organ for sperm production and male-horm…

Short stature (petite) is a height markedly below average and the taste oriented…

Kitou is the glans penis: the bulbous distal end of the penis, formed by the exp…

Ecstasy (Greek ekstasis, 'standing outside oneself') denotes rapture and self-lo…

The abdomen is the front torso region between thorax and pelvis. In Japanese ero…

Convulsion is involuntary muscular contraction. In a sexual context it denotes t…

Koukotsu is a classical Chinese-derived word for a dazed, entranced state. Datin…

Portio is the popular Japanese name for the portio vaginalis, the vaginal portio…

Dopamine and sexual pleasure: the neurobiology of the mesolimbic reward system, …

Shojo names the cultural category of the sexually inexperienced adult woman in J…

Slender is the Japanese body-type category for a slim, slender frame. Standing a…

Alcohol shows dose-dependent biphasic effects: low doses produce disinhibition; …

Ase is the Japanese term for sweat, the fluid from eccrine and apocrine glands. …

Bartholin's gland is a paired exocrine gland flanking the vaginal opening, secre…

Bijo is the Japanese category for adult women evaluated as having beauty. The ev…

Bikyaku is the Japanese aesthetic-evaluation term for shapely legs. Built on the…

Binyū names breasts evaluated for shape rather than size. The 'beauty + breast' …

Bishiri is the Japanese aesthetic term for beautifully-shaped buttocks. Stabilis…

Bishōnen is the Japanese aesthetic category for delicately beautiful young male …

Boin is a 1968-coined Japanese onomatopoeic-vernacular term for full and bouncy …

Bokki is the Japanese term for penile erection, the neurovascular event in which…

Erectile dysfunction (ED) is the inability to achieve or maintain erection for s…

Bonyū is the Japanese term for breast milk. Covers the lactational secretion pro…

Chikubi is the Japanese term for the nipple: apex of the breast, dual-functionin…

Chikyu (mons pubis) is the fat-padded prominence covering the pubic symphysis. S…

Chitsu is the Japanese term for vagina: muscular canal of the female reproductiv…

Vaginismus is involuntary pelvic-floor muscle contraction making vaginal penetra…

Clitoris is the principal sensory-erotic organ of the external female genitalia.…

Couple sexuality is the dynamics of sexual activity, preference, and satisfactio…

Daeki is the Japanese term for saliva, the clear bodily fluid from salivary glan…

Dai-inshin is the Japanese term for labia majora: outermost paired skin folds of…

Male menopause (LOH syndrome) is age-related testosterone decline causing reduce…

Dekoboko is the Japanese term for the hourglass figure: a body shape with marked…

Dōtei is the Japanese term for male virginity. Originates in Buddhist celibacy v…

Eiin is the Japanese term for perineum: the diamond-shaped soft-tissue region be…

Pheromones are chemical signal substances influencing conspecific physiology or …

Fukanshō names markedly-reduced female sexual response. The Japanese vernacular …

Futomomo is the Japanese vernacular for the thigh, the region between hip and kn…

G-spot is the colloquial name for a putative high-sensitivity region of the ante…

Gari is the Japanese body-category for an extreme-thin frame where rib, clavicle…

Teeth (ha) are the hardest tissue in the human body and a feature of facial-visu…

Phimosis is the medical term for inability of foreskin retraction over the glans…

Inkaku is the formal Japanese anatomical name for the clitoris: glans, body, pai…

Inkei is the formal Japanese anatomical name for the penis. The organ comprises …

Inmou is the Japanese formal term for pubic hair: terminal hair around the pubic…

Intersex names variation in sex characteristics not fitting typical male or fema…

Kakato is the Japanese term for the heel of the foot: the calcaneus-overlying re…

Kasshoku is the Japanese inclusive skin-tone category for tan-to-brown complexio…

Shoulder (kata) is the upper-body boundary between neck and arms. Japanese aesth…

Kinniku is the Japanese term for muscle in both anatomical and aesthetic registe…

Koumon is the Japanese clinical and vernacular term for the anus. The anatomy is…

Kubire is the Japanese term for the indented waistline between bust and hip. The…

Kuchi names the mouth in everyday Japanese, covering the oral cavity from lips t…

Kuchibiru is the Japanese vernacular for the lips, the mucocutaneous transition …

Kyokon is the Japanese colloquial term for an above-average-size penis. The Japa…

Libido is the Freudian psychoanalytic concept for the sexual energy underlying p…

Munei names the developed male chest centred on the pectoralis major. The depth …

Ninpu names the pregnant woman in Japanese: neutral in medical use and a recogni…

Nodo names the throat: the pharyngeal-laryngeal region from the back of the mout…

Oppai is the everyday Japanese word for breasts: between the clinical nyubo and …

How contemporary sexology classifies orgasm: clitoral, vaginal, G-spot, blended,…

Paipan is Japanese slang for a hairless pubic area on a fully adult body. Covers…

Penis covers the anatomy of the male external genital organ, the evidence on siz…

Pocchari is the Japanese onomatopoeic adjective for a softly fuller body, used a…

Dyspareunia is persistent or recurrent genital pain associated with sexual inter…

Seminal vesicle is a paired secretory gland behind the bladder producing most of…

Sexual self-disclosure is verbally communicating one's sexual preferences, exper…

Sexual satisfaction is the subjective evaluation of one's sexual life, a basic c…

Sexual aversion disorder is persistent aversion to and avoidance of sexual conta…

With age, testosterone and oestrogen decline and alter sexual desire and functio…

Senaka is the Japanese term for the back, the posterior surface of the trunk. Lo…

Shikyuu is the Japanese term for uterus: the pear-shaped hollow muscular organ o…

Shita is the Japanese term for the tongue, the muscular organ of the floor of th…

Sho-inshin is the Japanese term for labia minora: the paired thin skin folds ins…

Chronic stress raises cortisol and suppresses testosterone, causing reduced desi…

Sleep is a physiological foundation of sexual desire and function. Sleep loss sh…

Tarechi-chichi is the Japanese colloquial term for breasts descended under gravi…

Tsuchifumazu is the Japanese term for the arch of the foot, the curved region of…

Unaji is the Japanese term for the nape, the posterior surface of the neck. As a…

Waki-bara is the Japanese term for the flank, the lateral trunk from the lower r…

Yokujou is a Sino-Japanese word for the state in which sexual desire rises and t…

Bakunyu is the Japanese size category for breasts larger than kyonyuu, coined as…

Futanari is a Japanese subculture term for fictional characters combining female…

Hinnyu is the Japanese word for small breasts, originally coined as a contrastiv…

Kyonyuu is the modern Japanese word for large breasts. Popularised through 1980s…

Otokonoko is a 2000s Japanese subcultural term for someone with a male body who …

The A-spot is an erogenous zone said to lie deep in the anterior vaginal wall, b…

The penile frenulum is a thin V-shaped fold of tissue connecting the underside o…

HPV is the most common sexually transmitted virus; most sexually active adults a…

Erectile tissue is the spongy vascular tissue of the penis and clitoris. Blood f…

The urethra is the tubular organ carrying urine from the bladder out of the body…

Orgasm disorder is the persistent difficulty or inability to reach orgasm despit…

The ovary is the paired female gonad in the pelvic cavity. It produces and ovula…

Sex hormones are the gonadal steroid hormones: testosterone, estrogen, progester…

Tall stature is a Japanese fan-culture body-type attribute for women above avera…

Bote-bara is subcultural slang for the swelling belly of pregnancy and the fetis…

Facial features denote the overall arrangement and form of the eyes, nose, mouth…

Body type is the overall outline, padding, and skeletal balance of the human bod…

Koshi is the colloquial name for the lumbar region of the central torso. It is t…

The inner thigh is the skin on the inner side of the thigh, closest to the genit…

Nyuurin is the areola: the circular pigmented skin region surrounding the nipple…

The foreskin is the mobile fold of skin covering the glans. With outer and inner…

An erogenous zone is a body region of heightened responsiveness to sexual stimul…

Zenritsusen, the prostate, is a chestnut-sized male accessory sex gland below th…

Petite denotes a body type smaller in height and build than average. In adult wo…

The buttocks are formed by the rear of the pelvis and the gluteal muscles. An ob…