It's pretty simple for people that know FMK (f*ck, marry, kill). In this example you post 3 people, either from a fando(o)m or a person on the site and the next person decodes who to... have sex with, who to kill and who to marry. Example:
P1: Alucard, @Cream , grumpy cat
P2: f*ck Alucard...