Icing
Slang for semen.
Icolagnia
Sexual arousal by looking at pictures.
Id
The source of unconscious and primitive urges and desires in humans, according to Freud.
ILGA
Acronym for International Lesbian and Gay Association.

IMHO

In My Humble Opinion
Impotent
The inability to achieve or maintain an erection.
In the Closet
Often pertaining to one's sexuality or sexual preference. A state of privacy or secrecy.
In Vitro
Refers to lab experiments conducted in cell cultures grown in an artificial environment.
In Vivo
Refers to studies conducted within humans or animals.

Incall

Escort or prostitute who works takes calls at her place.

Incest
Sexual contact with a member of one's immediate family.

Incomplete Abortion
An abortion after which some tissue remains inside the uterus.

Independent, Indie

An escort who works on her own, without an agency affiliation. The escort manages her own calls, bookings, advertising and finances.

Infertility
A condition attributed to an individual who has unsuccessfully tried to conceive a child for one year or longer.
Ingravidate
To make pregnant.
Inhibited Sexual Arousal
The inability to become sexually aroused by a partner. Connotes a psychological cause.
Inorgasmic
Not able to experience an orgasm.
Intercourse
Penetration of a body part, such as the vagina or anus, by the penis.

Interpreter

Condom (e.g. She spoke French without the aid of an interpreter = BBBJ)
Intersexual
A person with both male and female sex organs.
Ipsism
Masturbation.

IPO

Initial public offering: used to denote the public introduction of a new provider, usually via a review.
Irrumation
Oral sex, specifically fellatio.

ISO

In Search Of

Italian

Penis rubbing between butt cheeks.
IUD
A contraceptive device that is inserted at the opening of the uterus to prevent pregnancy.