Past experiences are limited, but they came down to a few factors
* Not ready for this level of emotional investment or dependence by another person, they equated to becoming a mother even w/o being asked to engage at that level
* Coming from limited or even "vanilla" experience, introducing this falls in line for them as introducing bondage as their lives never conditioned them for such news and they really don't want to change that.
* It was seen as weakness to use that as a matter to help reduce stress or find comfort, eventually it created a resentment for doing it