If you're looking to adopt a cat, you might ask the volunteer at the shelter about that little orange kitten's age and sex. Sex refers to whether the cat is male or female.

In addition to referring to the biological categories of male and female, sex is also shorthand for the activity of being physically intimate with a romantic partner. This word can also be used as a verb: farmers who sex their chickens are figuring out whether they have a rooster or a hen.

Definitions of sex
  1. noun
    either of the two categories (male or female) into which most organisms are divided
    “the war between the sexes
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    type of:
    category, class, family
    a collection of things sharing a common attribute
  2. noun
    the properties that distinguish organisms on the basis of their reproductive roles
    “she didn't want to know the sex of the foetus”
    synonyms: gender, sexuality
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    maleness, masculinity
    the properties characteristic of the male sex
    androgyny, bisexuality, hermaphroditism
    showing characteristics of both sexes
    femaleness, feminineness
    the properties characteristic of the female sex
    the masculine property of being capable of copulation and procreation
    type of:
    physiological property
    a property having to do with the functioning of the body
  3. verb
    tell the sex (of young chickens)
  4. noun
    all of the feelings resulting from the urge to gratify sexual impulses
    synonyms: sexual urge
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    type of:
    the experiencing of affective and emotional states
  5. noun
    activities associated with sexual intercourse
    synonyms: sex activity, sexual activity, sexual practice
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    safe sex
    sexual activity (especially sexual intercourse) with the use of measures (such as latex condoms) to avoid the transmission of disease (especially AIDS)
    the act of becoming pregnant; fertilization of an ovum by a spermatozoon
    love, love life, lovemaking, making love, sexual love
    sexual activities (often including sexual intercourse) between two people
    carnal abuse
    any lascivious contact by an adult with the sexual organs of a child (especially not involving sexual intercourse)
    conjugation, coupling, mating, pairing, sexual union, union
    the act of pairing a male and female for reproductive purposes
    breeding, facts of life, procreation, reproduction
    the sexual activity of conceiving and bearing offspring
    arousal, stimulation
    mutual sexual fondling prior to sexual intercourse
    perversion, sexual perversion
    an aberrant sexual practice;
    autoeroticism, autoerotism
    using you own body as a sexual object
    promiscuity, promiscuousness, sleeping around
    indulging in promiscuous (casual and indiscriminate) sexual relations
    unrestrained indulgence in sexual activity
    gayness, homoeroticism, homosexualism, homosexuality, queerness
    a sexual attraction to (or sexual relations with) persons of the same sex
    an orientation of romantic or sexual attraction to more than one gender
    heterosexualism, heterosexuality, straightness
    a sexual attraction to (or sexual relations with) persons of the opposite sex
    bestiality, zooerastia, zooerasty
    sexual activity between a person and an animal
    abnormal sexual activity
    the act of depriving a woman of her virginity (especially by rupturing the hymen through sexual intercourse)
    roll in the hay
    slang for sexual intercourse
    hank panky
    illicit sexual intercourse
    the act of inserting the penis into a partner's vagina or anus
    assortative mating
    mating of individuals having more traits in common than likely in random mating
    disassortative mating
    mating of individuals having traits more dissimilar than likely in random mating
    criminal congress
    forbidden or tabu sexual intercourse between individuals
    crossbreeding, interbreeding, miscegenation
    reproduction by parents of different races (especially by white and non-white persons)
    generation, multiplication, propagation
    the act of producing offspring or multiplying by such production
    cross, crossbreeding, crossing, hybridisation, hybridization, hybridizing, interbreeding
    (genetics) the act of mixing different species or varieties of animals or plants and thus to produce hybrids
    the act of mating closely related individuals
    service, servicing
    the act of mating by male animals
    caressing, cuddling, fondling, hugging, kissing, necking, petting, smooching, snuggling
    affectionate play (or foreplay without contact with the genital organs)
    masturbation, onanism
    manual stimulation of the genital organs (of yourself or another) for sexual pleasure
    one-night stand
    a brief sexual encounter lasting only for a single night
    inversion, sexual inversion
    a term formerly used to mean taking on the gender role of the opposite sex
    lesbianism, sapphism
    female homosexuality
    paederasty, pederasty
    sexual relations between a man and a boy (usually anal intercourse with the boy as a passive partner)
    type of:
    activity, bodily function, bodily process, body process
    an organic process that takes place in the body
  6. verb
    stimulate sexually
    synonyms: arouse, excite, turn on, wind up
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    try to seduce
    type of:
    excite, shake, shake up, stimulate, stir
    stir the feelings, emotions, or peace of
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