Bacterial vaginosis (noun) - Infection caused by overgrowth of bacteria that occur naturally within the vagina. Symptoms may include a watery, grey vaginal discharge with a 'fishy' odor.
Balanitis (noun) - Inflammation of the glans of the penis or clitoris, usually caused by an infection. Irritation may also occur.
Balloon knot (noun) - The anus.
bareback (adjective) - Having sex without a condom, used especially for anal sex.
Barrier contraception (noun) - Contraceptive methods that act as a physcial barrier to prevent the male sperm from coming into contact with the female ovum. Barrier methods, especially the condom and other methods used in conjunction with spermicides, can give some protection against sexually transmitted diseases. See Cervical cap, Condom, Diaphragm.
Bartholin's gland (noun) - A gland located near the vaginal opening. During sexual arousal it produces secretions which provide some lubrication. Some have believed it responsible for reported cases of female ejaculation at orgasm but this is more likely to be the Skene glands.
BDSM (abbreviation) - Short for "Bondage and Discipline, Sadism and Masochism." A catch-all term for a broad array of sexual practices, especially involving restraint and inflicting pain.
Ben-wa-balls (noun) - See Love balls.
Bigamy (verb) - The practice of having more than one spouse. While illegal in some jurisdictions, it is traditional in others.
bisexual (noun, adjective) - A person interested in sex with both men and women. Compare HOMOSEXUAL, someone who has sexual interest in the same sex, and HETROSEXUAL, someone with sexual interest in the opposite sex.
Blastocyst (noun) - A small sphere of cells that enters the uterus from the fallopian tube and develops a cavity within itself as it implants in the lining of the uterus. The inner cell mass of the blastocyst develops into the embryo, an early stage in human prenatal development.
blueballs (noun) - When a man has an erection for a long period of time without ejaculating; this can cause a swollen, painful feeling in the testicles.
Blue Movie (noun) - A pornographic film or video. The term is derived from the blue pencil originally used to censor material considered unsuitable for general viewing.
bloodsports (noun) -. BDSM play that involves blood, including cutting and piercing.
Bondage (verb) - A sexual practice in which pleasure is gained by one partner being physically restrained by being tied up or bound. It can be a way of defining active and passive sexual roles and is also sometimes part of dominant or sadomasochistic sexual practices.
2. The one who is penetrated during anal sex, especially between gay males. Opposite of TOP.
breath play (noun) - Restricting airflow, by strangulation, suffocation, or other means for sexual stimulation.
brothel (noun) - A business establishment where prostitutes offer sexual services for money.
buddy booth (noun) - A booth in an adult video store that allows viewing and/or interaction with the person in an adjacent booth.
Buggery (verb) - A common term for anal intercourse. See Anal intercourse.
butt plug (noun) - A sex toy designed for anal penetration that has a flared base. Usually smaller than a typical dildo and not shaped like a penis.