Hey Bob,
I have done exactly what you are describing seems like a million times. It does one or two things to me usually
1. it starts a longer binge or even worse
2. I tell myself, "See? You can drink like a normal person! If I can avoid binging and just drink when appropriate, I can handle this!" This just reaffirms my disease and makes me forget all the pain and anguish it has caused. I find it helpful to think about how the whole story plays out if I continue.
Then again, I am NO expert and am at 3 days after a 2 week binge myself. If the person who you had adult time with is your spouse: My spouse is like yours and can be convinced that we can still have fun with alcohol. I am working on getting her to understand how serious this is. I wish you the best.