See, I dunno.... About the dinner thing...
IF You are a badass catch... If you're a single 30-something guy, and you're dating a series of divorced wives looking to get laid or for baby daddies...
Having an hour to talk to them can really reduce the RISK you will incur by taking a psycho home. I mean, there will be times when a man should walk away from easy sex with a girl. Get a few glasses of wine in her over dinner, and she'll get comfy. She'll start telling you about her crazy ex in the military. She'll tell you about how she's trying to get out of the gang life. She'll tell you that meth is both good and bad, for the following reasons. Or, "once I get my kids back from the state..."
There are times when you wanna make up a reason and bail. If she is drama, and that BJ will also equal a pissed off guy from iraq going apeshit on your when you see them in Walmart and she points you out, well.....