Reflecting, as equalist, on Na'ima Robert's 'ingredients for a successful Islamic marriage' (pp. 304-312) I do believe she offers good pointers:
1. Shared code of life
She emphasises (as devoted Muslim) the deen—an Arabic term (دين) meaning "way of life" or "code of life"—as the most important ingredient. A couple should respect the principles of each other's code of life—better still have a shared code of life. Both should act wisely and prioritise the other's needs. "There should be no lies, no deceit, no insults, no backbiting, no rudeness, no infidelity, no one-upmanship, no arrogance, no selfishness, no ungratefulness …" (p. 305). Spouses should tend one another—"to look after; watch over and care for". Spouses must give each other their rights and fulfil their respective responsibilities as agreed upon.
2. Appreciating one another
Gratitude should flow naturally from tending to one another. Robert refers (pp. 289 & 312) Covey's metaphor of an emotional bank account: loving moments, kind words and gestures, complementing, taking care, etc. are the equivalent of deposits into the bank account. However, arguments and being disappointed represent withdrawals.
3. Communication
"Couples must talk to each other, share their feelings and resolve their differences openly and honestly" (p. 307).
4. Patience
Robert states "Like all things that bring great rewards, marriage has its tests. A couple will not always agree, will not always please each other and will encounter obstacles along the way. Patience is essential in such times to keep the marriage going and eventually work the problems out." (pp. 307-8)
5. Humility
Robert states "Both partners should recognise that they are not infallible and that humility is not a sign of weakness — it is a praiseworthy quality. Accepting criticism graciously leads to self-improvement and a mutually rewarding relationship." (p. 308)
6. Gentleness
Robert states "There is no place for harsh words, foul language, raised voices or violence in a successful marriage. If the husband and wife treat each other with tenderness and sensitivity, they will both feel secure and safe within the relationship. This will only increase the love between them and make it easier to deal with any problems they may encounter." (pp. 308-9) And if I may add, I believe the same applies to same sex spouses.
7. Each fulfilling her/his responsibilities
Robert states that "Not only is it sinful to neglect one's responsibilities but it leads to many marital problems. Among these are resentment, loss of respect for each other, quarrels and, very often, separation." and that "They should both make sure that they are fulfilling each other's needs sexually". (p. 310)
8. Keeping the home fires burning
Robert states that spouses "are encouraged to beautify themselves for each another and this has wonderful effect on the marriage" and add "Keep the passion alive by exchanging gifts, little notes, planning romantic meals á deux, even if they take place by candlelight on the living-room floor after the children are in bed. The key is finding time for each other, to flirt with each other and make each other feel wanted." (p. 310)
9. Mutual respect
Robert states that "One of the keys to a good marriage is respecting one another's personalities, character traits and opinions" (p. 310) — do not try to change your spouse (the notion of women created from a rib—if you try to straighten it, you would break it—a beautiful metaphor not to try to straighten a rib [ignoring the created-from controversy within feminism) or a banana. "Neither partner should belittle or insult the other as this leads to either loss of confidence or seething resentment. In a mutually respectful relationship, each partner feels valued and confident in their role within the marriage." (p. 311)
10. Having fun together
Robert concludes with "Never overlook the importance of having fun together, or doing little things to break the monotony of the daily grind" (p. 311) Make use of sex toys to spice up intimacy, etc.
[My sincere apologies to Na'ima Robert; for quoting her outside of the devoted Muslim context and extending her thoughts to same-sex relationships.]
Robert, N.B. 2005. From my sisters' lips. London: Bantam Books,