[Solved] A maximal sustained muscle contraction is called A) a twitch. B) a threshold. C) tetanus. D) tone. E) summation. Sexual Activities: Behaviors involving sexual intercourse or other actions aimed at sexual pleasure. Abnormal: Diverging from what is considered normal or typical; often used to describe conditions or behaviors that are outside the statistical norm. Autoerotic Asphyxiation: A dangerous sexual practice involving the intentional restriction of oxygen to the brain for the purposes of enhancing sexual arousal and orgasm. Sexual Masochistic: Pertaining to a paraphilia where sexual arousal and gratification depend on experiencing pain or humiliation.