When a man pursues a woman who is not traditional or morally upright, what is he pursuing? Her looks. How can it be otherwise, when everything else about her is in the realm of the potential? (There are many women who claim to “love Jesus” and dress like whores, and are covert feminists.)
And because he does have a shred of decency left, he tries to convert her. But this is a terrible state of affairs, because it is the woman who will be the primary educator of the children, not the man.
How can one verify that a woman desires to truly please God, when they have suddenly become morally upright because of their future spouse? Always suspicious, due to the affections present between the two. What happens when that future spouse disappoints them? Will their newfound faith/morals also go out the window? Probably.