The problem here wasn't the husband's pre-marital abstinence, it was his wife's lack of it (she'd had previous non-marital relationships which included sex). She'd brought all of that previous non-marital sexual experience into the marriage bed with her and it became a wedge in their relationship. It put her abstinent husband at a disadvantage. To her, sex was about technique and not about a relationship.
I worded my thoughts wrong or was not clear. She did not leave him over his technique(which can be approved upon) but from what I remember he was basically a cold fish/frigid..whatever you want to call it.