I feel like the husband might have become puritanical out of a constant lack of self-awareness about his own sheer naivete and lack of relationship experience... like, even the inexperienced FL herself might have a broader understanding of these things, than him. Most likely scenario is, that female friend of his is also aware of this, and thus has never seen him even remotely as a love interest (but girl... help a fellow woman by giving this guy a hint, about how to make his wife happy, at least... for jeezaz sake!!)
I feel like the husband might have become puritanical out of a constant lack of self-awareness about his own sheer naivete and lack of relationship experience... like, even the inexperienced FL herself might have a broader understanding of these things, than him. Most likely scenario is, that female friend of his is also aware of this, and thus has never seen him even remotely as a love interest (but girl... help a fellow woman by giving this guy a hint, about how to make his wife happy, at least... for jeezaz sake!!)