Film

Say It Isn't So 2001

95 min TMDB 4.8 Comedy Romance

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.

Watch free in the UK

Not listed as free in the UK right now. You can still watch the official trailer below.