People will sometimes do things for the purpose of just exploration, or the zeal of living.
This is something I realize — our bodies oxidize and we look around at the trees, it’s sometimes not a quest so much as it is a compulsion.
In fact, reproduction is done in this exact mode.
From this logic, it follows that there’s less of an explicit purpose of reproduction than there is in, say, accepting your credit card receipt during a trip to the drug store to purchase allergy medication, your yearly ritual.