To me at least, it's not about being a Theology of the Body diehard...but more about why is he "ok with waiting for marriage"? Chastity isn't necessarily just about not having sex before marriage because the Church says so. If someone is waiting, but is okay with heavy making out, putting us both in the near occasion of sin, but thinking it's okay because we're not actually going all the way, or objectifying women based on how they dress or present themselves, or dressing or acting in a manner which will cause others to lust after him...even if he is "waiting until marriage" that doesn't speak to me of a real understanding of chastity. It's not that we're looking for reasons not to date, it's that we're trying to find the one that will treat us and others the way God intended. Do guys who have studied TOB tend to have a better understanding of this? Perhaps, but there are plenty of guys who have never heard of it and still act chastely. And it goes both ways, women need to be just as aware of being chaste in their lives as men.