A study titled Detecting Kissing Scenes in a Database of Hollywood Films discusses a system that uses 2D and 3D convolutional architectures (like ResNet and VGGish) to identify these specific scenes with high accuracy.
Because storage space on early phones was measured in megabytes rather than gigabytes, 3GP was a miracle. It allowed users to carry a 30-second clip of a famous movie scene in a file size often smaller than 1MB. The quality was grainy and the audio was "tinny," but for the first time, we had Hollywood in our pockets. Iconic Hollywood Kissing Scenes in 3GP lip to lip kiss video in hollywood 3gp