The Siamese Twins (Conjoined twins) are result of single egg fertilization which is medically related to their single sexuality. Regardless of the connection of two bodies to each other, these individuals sometimes are considered to be two independent characters, common in the body (multiple twins) and sometimes a single person, that some of its organs are redundant (single Twins). The present study was conducted in a descriptive-analytical manner based on Imamieh jurisprudence to study the jurisprudential challenges of adultery with respect to this type of obligation. The most important findings of the research show: Firstly, if multiple twins, both commit adultery. Since the nervous system is independent of the other, in the volume, it does not suffice to strike any member of the body. Second, in the hypothesis that one of them deserves to be punished, it is necessary to impose a limit, prevent its impact on another, and impossibility to prevent it will result in the abolition of the punishment. Thirdly, if adultery is to be realized by two separate units, the precautionary requirement is to impose limits on the main members. Fourth, in the hypothesis that it is based on multiple double standards, the genitals are two units. In the case of adultery by both, the unity of the penis is a unit of adultery, but because of both the interference of the crime, both Deserve full punishment, and in the assumption of one act and another dissatisfaction, the act is merely attributable to the person who is acting on it.