Friction and frustration taints your relationship, whether on a subtle or more overt level. Even if other aspects are more positive, this one adds some conflict to the mix. Although you're both comfortable as individuals outside the relationship, as a couple, there is some challenge to your individuality that is difficult to deal with.
This is your most apparent in your sexual connection -- your rhythms are off. You end up wanting different things at different times, and have trouble getting in sync with each other. This isn't impossible to overcome, but it has to be communicated about, both clearly and gently. The likelihood, however, is that your lover, especially, gets their feelings hurt; they perceive that you find them lacking in the bedroom -- whether or not that's accurate. This problem doesn't necessarily center on your physical connection, however. It could have more to do with the ways in which each of you communicates. Trouble arises when your lover starts to see you as being crass, abrupt, inconsiderate, even rude. Arguments erupt, and neither of you are able to distinguish important battles from foolish ones. Each of you is likely to feel that you're not being heard, and you have to rely on your willpower to get you through these conflicts. A determined and combined effort to listen to and support one another is key to making this last.