Isn't this just you holding more value on a romantic relationship than a platonic one? Why is the change from romantic to platonic, shrinking?

I meant the opposite. A relationship based mostly on sex will naturally have diminishing returns. Familiarity really does breed contempt, the Coolidge effect is a very real thing. It becomes an anchor that turns sex into a burden, and it's almost impossible to recover once that happens. I feel like the things that go into platonic love are more malleable and less prone to degradation and fatigue because they can be renewed in so many more ways. I didn't mean to imply that romantic love is on a higher plane than platonic, just that it has more potential pitfalls over the long haul. Speaking strictly for myself, scheduled sex is the unsexiest thing in the world. Sex is supposed to be unpredictable and break the norm, otherwise it's like drinking non-alcoholic beer. Spontaneous sex shouldn't have any expectations that cause stress, that's why its spontaneous - it happens when both people want it to happen - not on some arbitrary schedule by a marriage counselor that hasn't had sex in years. Just my 2 cents.