Lots of personal time so when you come back together you miss your partner a lot.

Marriage is not a “happily ever after”.

Communication and forgiveness

Respect and communication

Communication.

Making/taking time to spend with each other.

Efforts from both sides

Admitting when you have done wrong

Respect.

Friendship

Keep dating the person with whom you've given your heart to. Then your relationship and desire for one another won't be in question

Making time for each other?
Not letting new things (kids age, work) get in the way of reminding your spouse how attractive you find them inside and out. Still make time for play, not just sex but really fun playful time together. Being the best of friends. Talking things out when you are overwhelmed. When you fight being forward about what upset you in the first place and hearing them. Figuring out solutions together. Do your best to keep out of a rut, make the effort to keep things interesting.
Be supportive and loyal. There is a whole lot more too I bet.

Sex. sex, sex! lots of sex. Kinky sex. fetish sex. bondage sex.

Separate bathrooms

that wedding cake

Compatibility with eachothers darkest desires. If you are into bdsm or a fetish, and your significant other isn't , you will never be truly happy...

Great communication-great sex - great teamwork