The law clarifies the issue of consent by making it clear that people can change their mind even while having sex. If someone says "no,'' the other person must stop or it becomes rape.
Sen. Dan Rutherford of Pontiac says the bill was inspired by a California case involving two teenagers. The girl changed her mind about having sex, but the boy did not stop immediately.
He was charged with rape, and it took years for the courts to decide where California law stood on the issue.
Rutherford said the new Illinois law should prevent that kind of protracted court battle.
Gov. Blagojevich signed the law Friday but did not reveal his action until Monday.
(The bill is SB406. On the Net: www.legis.state.il.us)