 | Safe sex: Sexual activity that is completely free of risk for
STD. It is non-existent.
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Safer sex: Sexual activity in which the risk for STD has been
greatly reduced to a low level.
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 | Sex: Two meanings:
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The definition of a person as male or female, based on their
physical appearance, and/or primary sexual characteristics, and/or sexual chromosome structure and/or their perceived gender. In almost
all people, their perceived gender match the other three factors. For
a minority, they differ.
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To engage in a sexual act. e.g. "to have sex."
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 | Sex reassignment therapy: The use of hormones and perhaps sex
reassignment surgery to help a transsexual change their appearance from the
sex that they were identified with at birth to the opposite sex that they
feel they truly are.
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Serial monogamy: The concept of having multiple sexual
partners over a lifetime, in a sequence of committed and sexually exclusive relationships. Many, perhaps most, adults in North America experience this.
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Sexual act: This is not a well defined term. Most would define it
as including all oral, anal, vaginal, and manual activity which has as its
goal of arousing a person. Many teens do not include oral sex as a sexual
act. Thus, they might consider themselves to be sexually abstinent, and even a virgin, even though they
engage in oral sex.
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 | Sexual identity: an individual's overall feelings including their
sexual orientation (heterosexual, bisexual, homosexual), genetic gender (male,
female, intersexual), gender role (masculine or feminine), and gender identity
(transgender or cisgendered).
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Sexual orientation: Some
religious and social Christian conservatives define as many as 30 different sexual
orientations. The rest of the world has reached a near consensus that there
are three sexual orientations: heterosexuality, bisexuality and
homosexuality. Sexual orientation is normally largely based on ones feelings of sexual attraction. Among some religious and social conservatives, it is based on ones sexual behavior.
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Sharing: When used in a sexual sense: multiple couples who perform sexual acts with their own spouses within view of the other couple(s).
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Sodomite: A derisive term used to refer to sexually active males with a homosexual or bisexual orientation.
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 | Sodomy:
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Historical origin: A resident of
Sodom, a town in the Middle East that was
allegedly destroyed by God.
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Legal usage: One of a list of sexual activities other than
penile-vaginal intercourse between a man and woman that is criminalized within a political
jurisdiction.
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 | Religious conservatives: Some use the term as a synonym for anal
intercourse.
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 | Sperm: Male reproductive cells. Single: spermatozoon.
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STI: Acronym for Sexually Transmitted Infection: Any infection transmitted by bacterium, fungus, parasite or virus primarily
during sexual contact.
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STD: Synonym for STI. It is being phased out.
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 | Stillbirth: An event in which a fetus after
the 24th week of gestation, dies from natural causes and is expelled from
the woman's body.
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Swinging: In a sexual sense, the temporary exchange of sexual partners
between two or more committed couples, usually performed under strict behavioral rules.
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 | Teleiopilia: A condition in which an adult, usually male, is
sexually attracted to both adults and, under some circumstances, to
children.
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Transgender (a.k.a. TG):
This word has multiple meanings:
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A person who experiences gender dysphoria or gender identity
disorder. They identify themselves as experiencing gender identity that
is is in conflict with their genetic or birth-assigned gender.
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 | Some consider transgender to be an umbrella term which includes:
 | Preoperative transsexuals. |
 | Postoperative transsexuals. |
 | Nonoperative transsexuals. |
 | Transgenderists: persons living full-time in a gender other than
their birth sex. |
 | Cross dressers: persons who occasionally present themselves as
the opposite sex. (Transvestite is a synonym, but is regarded by
many cross dressers as a pejorative term). The vast majority are
heterosexual men. |
 | "Mannish" women and "feminine" men whose gender expression is
opposite to their sex. |
 | Intersexed persons who are born with genitals that are not
typically male or typically female. They are frequently defined as
male or female at birth. However, they often develop physically or
have a gender identity in opposition to their assigned gender.
See above.
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 | Transsexual (a.k.a. transexual, TS, transsexed,
transidentity, trans, tranny, T-folk, trans folk): As for
the term "transgender," there is no consensus on the precise meaning of
this term.
 | One common definition is that a transsexual is a transgender
person who experiences severe gender dysphoria and feels they can "no
longer continue to live their lives in the gender associated with the
physical sex they were assigned at birth. " 4
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Some restrict the term to including only those undergo hormone
therapy and/or gender reassignment surgery (GRS) in order to more
closely appear to be of the sex that they feel they are. |
Additional factors:
 | Some transsexuals consider the term trans and tranny to be
offensive.
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Some post-operative transsexuals typically do not refer to themselves as
transsexuals; they regard themselves as having become either male or
female and identify themselves accordingly. Religious and social conservatives generally refer to transsexuals according to their birth-assigned gender.
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Some prefer the term transgender as more appropriate transsexual
because gender identity is all about gender, not sex.
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 | Transvestic fetishism:
A psychiatric condition in which a person -- almost always a male
heterosexual -- is significantly distressed by a recurrent sexual arousal
due to thoughts or practices of cross dressing.
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Transvestite: Another term for "cross-dresser." The term transvestite
is regarded by many cross dressers as a pejorative term. We recommend that it never be used.
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 | Triad: In a sexual sense, this refers to sexual activity by
three persons, whether in a committed or casual relationship.
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 | Virgin: A person who has never engaged in sexual intercourse.
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 | Yoni: Sanskrit for "sacred space" or "sacred temple." Refers to a
woman's vagina.
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Zygote: A form of life with human DNA originating as a fertilized ovum, and which has not
yet implanted in the wall of the uterus. |