The word of consent by law means the voluntary agreement with an action proposed by another side. Consent is an act of reason that the person who provides the consent is of sufficient mental capacity and is in possession of all essential information in order to give a valid consent form. A person who is an infant is mentally incompetent, or a person who is under the influence of drugs is not capable of giving consent. Consent must also be free of coercion or fraud too.
Consent is required regardless of whether the person initiating the act is under the influence of drugs and/or alcohol. ... Consent cannot be given when it is the result of any coercion, intimidation, force, or threat of harm. Threats can not be used to get consent.
Information from:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4236989/
