I would argue (e) and (e1-e2) fall into the range of (d) or (c) most of all. Masturbatory or porn addictions make sense among people who are themselves not very attractive and only attracted to highly attractive people. The "hormonal reasons" of proposed (d) fit into the health related and morbid obese reasons of (a) to me. I suppose it is a matter of definition. So perhaps (a) should be "health reasons" and (b) should be "mental reasons" with (c) being "stupid fuckers". Vague enough to encapsulate all perhaps?

In any event the reason for my skepticism you perhaps understand. Having been in a relationship with one, I've found myself exceptionally hostile to them as a concept. People who hide behind their traumas and problems who, instead of working through them with their partner, decide to reject said partner in favor of adopting an identity to hide behind. Instead of addressing a porn problem, or being honest about not being attracted, or working on their health. Maybe you can't offer me many answers if you are self aware, but my query relates to why such people are so cowardly as to run from the obvious? If you have someone who loves you, just wants to work with you, to give you time, why would you just reject that? Forgive the projection, but I do wish to receive some input on this matter.