Why would you be with someone you don't want to sleep with?

So many people seem to be chasing someone for a relationship and then, once in the relationship, don't show interest in being sexually active. I don't get it. I'd have to be "into" a person who I'm in a relationship with... Perhaps y'all can explain why anyone would be in a (sexually/sensually) lifeless relationship?

Why would you be with someone you don't want to sleep with?
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