bulb's analogy is horrible.
Even if you felt that someone's partner was lacking affection, why would you even bring it up? Not only that but why would you feel the need to always tell them and then use examples to convince them? Surely you are not doing it because you actually love the person and want better for them. You do it because you're an a.sshole who thinks he is right and wants to publicly prove it by discrediting another. And that's what most atheists are - those that go around inciting debates with Christians and believers of other religions, that is.