Consent is when one person agrees to the proposal of another person. It is a term of common speech and is used in the field of law, research, medicine, sexual relationship. For example, a person with a mental disorder or under the legal age of sexual consent may willingly engage in the sexual act if he still fails to meet the legal threshold for consent. Sex education programs in the U.S believe that teaching about the topic of consent should be a part of comprehensive sexuality education as it will be very beneficial. There are various types of consent, like informed consent, expressed consent, implied consent, and unanimous consent. Expressed consent is clearly stated through writing, speech nonverbally. Implied consent is a consent which is inferred from the person's actions and circumstances of that particular situation. For example - physical contact by the participants in a hockey game or being assaulted in a boxing match is implied consent. Informed consent is used in medicine. It is a consent given by a person who has a clear understanding of the facts, implications and the future consequence of that action. This term is also used in social science research or in a sexual relationship where informed consent means a person engaging in sexual activity is aware. Unanimous consent is a general consent by a group or various parties. It is a consent which is given by all the parties. In medical law, consent is important to save and protect the medical practitioner from the liability to harm the patient only on the condition that the medical practitioner must explain all the risk of procedure (that might occur to the patient during the treatment) before the patient can give binding consent. Consent is also used in legal term; consent is the signed documents which indicate an official approval of an action. For example, - minor requires parental consent before undergoing an abortion.