In reply to:

boredom can't be the answer, because everyone gets bored, but everyone doesn't do the same things!

Doesn't necessarily follow. An instinct can express itself in all sorts of different ways. Take sex, for example. We all have a sex instinct, but the way it shows itself can take all sorts of different directions in different people at different times in their lives and in different circumstances depending on our environment in the womb and afterwards, up to and including who or what is available at the time.

Bingley


Bingley