Personally I could not do a fwb or nsa relationship because I know myself enough to know I would get attached. A sexual experience with another person over a long enough time creates attachment. For some people it's just one time. When you have sex your brain releases oxytocin which cause an increase in trust and bonding, which in turn could make you susceptible to make bad decisions. Now some people overcome this and can treat it as purely causal, but I am not one of those people. The way I was raised was love should come first before sex, society for the most part seems to put sex first. If you have biological needs you can address those by yourself. If I read your sitch right you went 27 years without sex, while no sex $ucks you wouldn't die without it. If you are needing an emotional connection I don't have an answer. That is something you have to figure out, I definitely crave that emotional connection with my W which feels even worse since one of my primary LL is physical touch.
I think you should reflect on yourself and determine your strengths and weaknesses, your morals, values, goals. If a NSA/FWB is something that you can do and you understand the pros and cons of it then you can determine if it suites you.
H(37) W(35) D8, D5, S3 T20, M13 BD 8/31/18 EA Discovered 9/13/18 Mediation 10/3/18 W files for D 10/12/18 W moves out 11/10/18 EA confirmed 12/25/18 D Final 1/10/19