Nothing inherently wrong with it, in the same way there's nothing inherently wrong with a relationship based entirely on casual sex with no attendant intimacy or commitment.
In both cases, though, in practice, you're likely to find one side is getting exactly what they want out of the relationship, where the other is holding out for more.
In both cases, though, in practice, you're likely to find one side is getting exactly what they want out of the relationship, where the other is holding out for more.