Say It Isn't So
They share a love. They share a passion. And they might share DNA.
3/10/2001
Imdb: tt0239949
Tmdb: 20309
Popularity: 13.23
Vote: 4.702/10 (163)

Boy meets girl; boy falls in love (and had wild, non-stop sex) with girl; boy loses girl... when they discover they are brother and sister! But when he learns that he's the victim of the ultimate case of mistaken identity, the lovesick young man -- whom everyone still thinks is after some taboo thrills -- must race across the country to stop her from marrying another man.