Ariel's Typical First Date

OK y'all. Does sex on the first date kill any chance for a future? We take cars out for test drives, we try clothes on before we buy them, we take the free teriaki chicken samples from the little Asian lady in the Food Court. Therefore, it seems that something as important, nay, as ESSENTIAL as sex should certainly be determined from the git-go, the introduction, the hi-how-are-ya, the nice-to-meetcha. And yet...something about a cow and free milk. Can you help fill in the blanks?