Need help with ENM Consent Agreement

I'm a 68 year old African American male married 28 years. I'm stuck in a sexless marriage. We are both retired empty nesters. She lost all interest in sex but I'm not ready to hang up my tennis shoes yet. Sex keeps me vibrant and alive. It gives me an intimate connection with another human being

I would like to pursue a shame and guilt free LDR sexual relationship while staying within my moral boundaries.

Is there any way outside of total abstinence to escape the moral shackles of a sexless marriage?

Does anybody here have any experience negotiating ENM consent agreements?