Eva Green & Sullivan Stapleton, 300: Rise of an Empire
Not the Gerard Butler movie, the other movie called 300, which was released in 2014. The sequel details the continuation of Butler's epic saga, and it features a rather unusual love scene between Stapleton and Green, who play each other's rivals. The saying "keep your enemies closer" is taken to a whole new level in this movie moment.
Reese Witherspoon & Mark Wahlberg, Fear
The classic rollercoaster scene between a very youthful Witherspoon and equally baby-faced Wahlberg is what solidifies his creepy obsession with her and ultimately drives him to the point of craziness. What starts off as a seemingly-innocent teenage love story quickly turns villainous as Wahlberg does whatever he can to pursue the perceived love of his life.