1. Your relationship must be based on a solid, underlying friendship. Friends talk, laugh, share, and do things they're interested in together. Don't stop being friends just because you're each other's spouse.
2. Your relationship has to meet the needs of the two people involved. Understand what your partner's needs are so you can meet them. Figure out what your own needs are and communicate them. If your needs are not being met, communicate and negotiate. Don't let resentment build.