I think most of us agree that the "Lilly is virgin again" thing is a little weirdly put on, and I maintain that it probably would have worked differently to show Lilly how healthy and holding relationships should work. My thought goes in the direction of romantic dating and doing something good for the other person without ulterior motives.
But gee, maybe Frank is just a closet romantic and let's face it, this approach is far from the dumbest in AVN. For me personally, it's "Let's have this character who has massive social phobias and gets panic attacks go to a party where she doesn't know anyone so she can make new contacts, what could possibly go wrong?"
And at least Frank had enough common sense to tell Abby about her father before he eventually shows up at the front door and the whole story blows up in his face.