>>30903023Not sure if troll or 12 year old
If it's the latter, I will humour you.
Most female mammals exhibit this behaviour, they are presenting themselves as a prospective candidate for mating by pushing out their derriere ( making that pussy pop) and spreading those sweet, sweet pheromones out into our nose-holes so we are more likely to want to breed with them.
If you can't understand why they do it, that is probably because you are not a woman/gayboii so congrats on that friend.