Sexless marriages can last. There' s like 14 millions Jews in the world. A lot of them are married.
Seriously though, not everyone prioritizes sex. More to the point, I don' t see how a marriage can ever last while both being content. Why would any sane person want to live with the same person for the rest of their life? I don' t understand this. People shouldn' t get married before they' re 50. That way they can have fun with as many people as possible.