Not just sex. Admittedly, sex and reproduction and parenting is a big deal. For some people, that is all they can reckon with. However, between habituation and genuine affection, love can be a very strong force. Have you ever looked into the eyes of someone you love and just wanted to " eat them up"? I bet you have. I suspect most people have. Even if the person is indeed a marital partner, consuming them or diving into them is not available. In addition to sexual attraction and actions, there often is a more intense feeling that is not sex. Sometimes, it can be disappointing that one can't just reach inside another's chest and tweak their heart.
It can help sometimes if a message can be fashioned that expresses the frustration with this world's limitations. A good solid hug can sometimes help.
