nonconsensual

adjective

1. formed or existing merely by consent: a consensual transaction.
2. Physiology. (of an action) involuntarily correlative with a voluntary action, as the contraction of the iris when the eye is opened.

adjective

1. law (of a contract, agreement, etc) existing by consent
2. law (of a sexual activity) performed with the consent of all parties involved
3. (of certain reflex actions of a part of the body) responding to stimulation of another part

adj.1754, “having to do with consent,” from stem of Latin consensus (see consensus) + -al (1). Meaning “by consent” is attested from 1800. adj.

1. Of or relating to a reflexive response of one body structure following stimulation of another, such as the concurrent constriction of one pupil in response to light shined in the other.
2. Of or relating to involuntary movement of a body part accompanying voluntary movement of another.