I don't remember PK that well. I went to a few conferences... In general, the biggest issue that I have with much of the marriage content I've seen taught in mainstream Christianity is that they take the idea that the husband needs to love his wife sacrificially (like Christ does the church) to a place I'm not sure it was intended to go. There's little or no emphasis on headship or submission on the female's side, and much of what I've seen on that side has a strong feminist weight to it. The end result is that the husband feels that in a conflict between him and his wife, he must always be the one to bend or he's being selfish. So leadership in difficulty can feel like sin when it's not. I do think that sacrificial love is important, but Christ died for the church to make her holy... not to let her have her way. The purpose of spiritual headship is to guide the family to holiness. That's not always pleasant or easy. Some phrases, like "out love your wife" are good, but love takes many forms and appearances and many current marriage guidance resources for modern christians have a one sided emphasis.