No, it's not an oversimplification of anyone or anything. I will say your bar analogy is pretty good, though. If you go home with someone from a bar (that you met that night), the general expectation is that it won't be something serious.

I mean, come on, it's not that hard to see the overarching point here. Even pop culture portrays it this way (see Knocked Up, Trainwreck, etc.).