Imagine you had never hugged anyone at all before and you would really like that intimacy with someone you like (not a family member or friend). Maybe it would feel a bit like how a virgin wonders about the intimacy of sex, except without the horniness :P
I would say the best thing about sex is the intimacy, and say you were married to them for years and years, although sex is still about lust too, mainly it is then about intimacy. So in this situation I would say that it's like a very serious hug that means you are very devoted to them, haha!
At other times though, like one night stands or casual sex, it can be about your ego, or just to relieve your sexual tension. Also of course you can hug your family and friends, but the thought of sex with them just doesn't sit right in your mind, unless you belong in game of thrones.
So in answer to your question, sort of, but it's a strange question to ask!