There is one meaning of life and that is life itself
Personal meanings of life are personal, hence optional
I'm not talking about personal meanings.
I tried to say that with the Sagan quote. "We are a way for the cosmos to know itself." This isn't exactly a "personal meaning". It's general.
We - that is, life - are nothing but castaway stardust. Yet we became "alive" at some point. And the quest to understand the world around us must've been a "need" from the very start. At the cellular level. To move. To bond. To seek. There was "meaning" in this discovery process. Or rather, the discovery process is meaning itself.
What I'm getting at though is that reproduction could've been just a byproduct of this original need. That perhaps first we became seekers, then reproducers.
edit: Sorry, I'm a little tired, so I hope I articulated my point. Getting way off the subject though...