Right, so the sign of this gift (in my view) is a settled ability to offer that part of life to God without becoming divided or bitter.
I think you meant ‘nobody has to get married or have sex to survive.’ Biologically… sure. But Scripture seems to be asking something deeper: what kind of life has God actually given you grace to live?
When Jesus says ‘Let the one who is able to receive this receive it,’ I hear an invitation rather than a universal rule. Almost like He’s naming a capacity some people come to recognize over time.