Sex is the glue/foundation that holds relationships together. Agree or disagree?

I tend to agree, as in if the foundation is not there for the relationship, then attention starts to wane/flag and people start becoming uninterested in each other. Note: I'm not saying here that sex is the only important thing in a romantic relationship-- I'm asking if it's the *most important underlying factor* in a relationship.
Sex is the glue/foundation that holds relationships together. Agree or disagree?
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Sex is the glue/foundation that holds relationships together. Agree or disagree?
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