The levels of your passion might vary over time, and could be at different levels between you. More specifically, you might always be more attracted to this person than they are to you. That can be a difficult dynamic for both of you to deal with.
This aspect forces adjustment on both your parts, because you find that you're not well matched when it comes to sensuality. Your styles of intimacy are different; you find different things sexy and have a hard time matching up your tastes, and your drives. You are attracted to each other, however, if in a strange way -- you might actually be drawn to each other because of the differences between you! You find, though, that you're not into the same things when it comes to intimate play. Your rhythms are off; one or both of you runs hot and cold, and it's difficult to find a time when your energies are matched up and running strong. Your patience with each other may run short as a result, because you always feel as if you're either not getting enough of what you want, or you're getting too much. You both learn a lot about yourselves and your own needs and rhythms in a sexual relationship, if only because your needs are contrasted against each other. But your unfulfilled desires may prove to be too much to handle, over time. If you want things to work out between you, you both have to strike a compromise in order to meet both your needs.