Is it ensure, insure, or assure?
late 14c., "inability to restrain sexual desire, sexual immorality," later "inability to keep to a religious rule" (early 15c.), from Old French incontinence "lack of abstinence, unchastity" (12c.) or directly from Latin incontinentia "greediness; incontinence," noun of quality from incontinens "incontinent, immoderate, intemperate" (see incontinent). Meaning "inability to retain bodily functions" is from 1754.
late 14c., "wanting in self restraint," from Old French incontinent, from Latin incontinentem (nominative incontinens) "incontinent, immoderate, intemperate," from in- "not, opposite of" (see in- (1)) + continens (see continent). Originally chiefly of sexual appetites; sense of "unable to control bowels or bladder" first attested 1828.
incontinence in·con·ti·nence (ĭn-kŏn'tə-nəns)
The inability to control excretory functions.
Lack of restraint in sexual relations; immoderation.
incontinent in·con·ti·nent (ĭn-kŏn'tə-nənt)
Lacking normal voluntary control of excretory functions.
Lacking sexual restraint; unchaste.