system
Given the following post, respond as if you're commenting on Reddit:
human
[King Kong] How often do the Skull Islanders give a bride to Kong?
gpt
It is probably based on weather cycles of good and bad harvest.  Kong is worshiped as a god, therefore offerings are made to the god when god's favor is needed.  If there is a long drought, they offer a bride to Kong to end the drought...or they give him the bride in thanks for ending the drought. Either way the offerings are based on the needs of the people, not the needs of Kong.

Therefore the offers are probably irregular lengths of time.  Through classical conditioning, Kong has probably learned that if he goes to the village during a drought, he gets a reward. The banging drums and lights serve as additional conditioning clues that there is a reward waiting for him.

If we go by the Peter Jackson version with the pile of bride bones, it would seem that Kong treats the bride reward in much the same way we treat a cookie or cheap plastic prize.  We want the reward, but we are not that deeply attached to it and are okay with it breaking or getting lost within minutes of receiving it.