Personally, I would not look down on or think less of such a woman any more than I would think poorly of man who had sex on a first date. Nor would any intelligent man, in my opinion, unless it’s for religious reasons. Remember, too, that just because it’s a first date doesn’t mean the two people barely know each other. They may have known each other for some time but started dating. Most of my relationships became sexual very early on–if not the first date then shortly thereafter–and one such relationship has lasted now for nearly 20 monogamous years.