So to a hypothetical alien civilization, humans probably seem to spend a lot of energy on sex.
I mean, it’s nothing when compared to the effort most (male) birds dedicate to it…
Also, flowering plants, especially the ones with edible fruit.
Also, any fungi that produce mushrooms.






Because the enemy is senile and flipflops depending on who he last talked to, and will give you what you ask for if it can hurt someone (missiles, in this case) and you give him a particularly garish shiny bauble in exchange.