Is it ensure, insure, or assure?
early 15c., "carnal, unspiritual;" mid-15c., "of or pertaining to the senses," from Middle French sensuel (15c.) and directly from Late Latin sensualis "endowed with feeling" (see sensuality). Meaning "connected with gratification of the senses," especially "lewd, unchaste" is attested from late 15c.
sensual sen·su·al (sěn'shōō-əl)
Relating to or affecting any of the senses or a sense organ; sensory.
Of, relating to, given to, or providing gratification of the physical and especially the sexual appetites.