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Jism

A slang term for semen.

Jerk-off

A slang term usually for male masturbation but can be used by women also.

John

A slang term for the customer of a prostitute.

Kama Sutra

An ancient Hindu manual that celebrates sex as promoting harmony and glorifies sexual pleasure for both men and women.

Kaplan's tri-phasic model

A model that, unlike Masters and Johnson's model, divides sexual response into three phases: desire, excitement, and orgasm.

Kaposi's sarcoma

A formerly rare cancer of the blood vessels that is now common as one of the opportunistic infections that strike people with AIDS. It appears as lesions on the skin.

Kegel exercises

A set of exercises designed to intensify orgasm and arousal and increase sexual pleasure and awareness by strengthening the pubococcygeous (PC) or pelvic floor muscles.  Also helps prevent and improve incontinence. 

Klismaphilia

A sexual behavior in which a person derives sexual arousal by giving or receiving enemas.

Labia majora

The fleshy, hairy pads of tissue on either side of the vaginal opening and inner lips. Also known as the outer lips.

Labia minora

The hairless flaps of skin on either side of the vaginal entrance, between the outer lips, that surround the clitoris and the vaginal opening. Also known as the inner lips. 

Lesbian

A female homosexual.

Leydig cells

Cells within the testes that secrete androgens. Also known as interstitial cells.

Libido

Sexual desire.

Limbic System

The set of structures around the midbrain involved in regulating sexual behaviors.  

Lubrication

A slippery fluid secreted from the walls of the vagina during sexual arousal.  Available as a supplement in synthetic form also. 

Lust

A very strong sexual desire or urge.  

Luteinizing Hormone (LH)

A hormone produced by the pituitary gland that stimulates female ovulation and male androgen secretion.  

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