Have you seen this much? I know this happens among the JW girls too. I had seen this many years ago as a JW but a couple recent circumstances I have been informed of this happening now as well.
Young JW males dating non-JW girls. Some still active, some fading (not because of questioning JW doctrines), perhaps just wanting a bit of the wild side. Then sooner or later he falls for the nice non-JW girl, likes her, considers long-term/ or married already. Still believing the Watchtower Society is the 'truth', he wants his girlfriend or wife now to study and become a JW.
He may or may not be disfellowshipped at this point. Some of his motivation may be that she will be taught that the wife should be in submission to her husband? In the past, I've also seen she later becomes a JW, quite "theocratic" and then he leaves the organization again and her and the kids.
Have you seen this?