sex

   1. copulation

   Literally, the classifications male and female, although the euphemistic use has long been standard English. Heterosexually or homosexually:

    I could have asked to wash after sex. (S. Green, 1979)

   Sex love is obsolete:

    Katie told [Parnell] in 1891... that 'sex love' between herself and Willie was 'long-since dead'. (Kee, 1993 — Katie was Mrs O'Shea and Willie was her husband)

   The American sex worker is a prostitute, although I prefer, etymologically speaking, the alternative form sex care provider, whose therapy is strictly non-medical.

   2. the penis or vagina

   Referring to the reproductive functions. The penis:

    I rubbed my hot sex against her little button. (F. Harris, 1925)

   or the vagina:

    'Oh how lovely your sex is!' I exclaimed ... my left hand drew down her head for a long kiss while my middle finger still continued its caress, (ibid.)