Sarah's reasons
Why does Sarah decide to have sex with Johnny after his coma once but only once? Surely it'd be kinder to him, if not having a continuing relationship like that, not to do it at all? Was she temporarily overwhelmed by passion but subsequently mindful of her marital responsibilities? (This wasn't my impression.) Or is she being selfish and just satisfying her curiosity about what it would be like with him? In the event, maybe not great, as she doesn't want a repeat. But then, I suppose it might well have been the chaste Johnny's first time. And last.
I beseech ye in the bowels of Christ, think that ye may be mistaken.