We should frequently teach and repeat the fact that "women with tattoos are sluts" or "easy". There needs to be some shame in it.
Yes, be nice to women who have repented/converted from their promiscuous ways, but don't be ashamed to tell your son that tattooed women are sluts -- even with Ms. Magdalene (a convert, with tattoos) standing a few feet away in earshot. If she is a true convert, and truly repented, she would step in and affirm what you said -- she would HELP YOU teach your son to steer clear of such women. She certainly wouldn't get angry -- that's a sign of wounded pride, and pride is not present with true repentance. HUMILITY is.
Keep in mind that women are much more consensus driven than men. They won't do things that most of society abhors. They want/need attention AND APPROVAL.
If society has said, in no uncertain terms, that tattoos make you an undesirable slut, than most women will steer clear. It's that simple. Human (in this case, female) psychology.