The worst example of sex in film has to be the sex scene in the Matrix trilogy. Easily the most boring two minutes of the whole thing. They didn't even show it going in so what's the point
My understanding (and it’s been awhile) is that the choice Neo made by going with Trinity and being alone with her instead of the group was a crucial moment which foreshadows his decision to save Trinity instead of fulfill his duty to as “the one” to reboot the matrix.