ah yea, that fine question everyone asks just because they know you cant answer it, well, im going to give you, what I believe, the most accurate answer I can give to it, and that is

to reproduce..
why? its pretty simple, all species/animals want to survive, right? well, the only way they can is by creating more of themselves, if that certain species/animal can no longer reproduce, it will eventually die off. so within all of us, we have a arsenal of emotional triggers and "tools" to fuck the living hell out of each other.., and really, that's the only reason your alive, to bang. So when you die off you'll have someone to take your place..

what do you guys think about this question :P?(and yes im posting random philosophy questions..)..