The sexual offense of involuntary deviant sexual intercourse is a very similar offense to other sex crimes such as rape. This crime of IDSI is defined under section 3123 of the Pa criminal code. CYS investigations The difference between Involuntary Deviant Sexual Intercourse and Rape is that this offense covers more sexual acts and excludes any type of vaginal penetration, which the charge of rape would cover. Acts that would be covered under this statute include sexual intercourse with an animal, any penetration, however slight, with a foreign object, and forcible anal or oral sex. As stated previously it is very similar to the statue of rape. This is an important distinction for prosecutors because if they believe that their case would not fit the criteria for the charge of rape, they can instead charge the accused with the more encompassing charge involuntary deviant sexual intercourse.