My original thought was Cruel Intentions, but they were step siblings, not siblings, so it oughtn't count.
Imaginary Heroes features two brothers - not realizing that they are brothers - who engage in a night of gay sex. It was a great movie, despite the oddness of its plot.
The French film Murmur of the Heart implies that a boy had sex with his mother, including a moment or two in which they discuss the events of the previous night. A great movie!
Haven't seen this one yet, but I hear that Bad Boy Bubby is about as bad as they get when it comes to incest.
Imaginary Heroes features two brothers - not realizing that they are brothers - who engage in a night of gay sex. It was a great movie, despite the oddness of its plot.
The French film Murmur of the Heart implies that a boy had sex with his mother, including a moment or two in which they discuss the events of the previous night. A great movie!
Haven't seen this one yet, but I hear that Bad Boy Bubby is about as bad as they get when it comes to incest.