Magical Healing Cock
The Magical Healing Cock is a fanfic trope that's probably been around since Kirk and Spock were first slashed. It refers to a trope where one character is either emotionally or physically injured, but all is healed (metaphorically) when they have sex. Often found in Hurt/Comfort stories.
Vaginas generally appear to have less healing qualities.
A version of this is the trope and then they had sex.