When Doug and Annie Brown realized they weren't having sex for months at a time, they made a pact to have sex every day for 101 days. Then, they wrote a book about it.
In this article in the Boulder Daily Camera, writer Aimee Heckel discusses how the neurochemistry of sex, including tons of oxytocin released during touching and orgasm, makes every part of the relationship better. She interviewed Doug Brown, who said that while they really really didn't want to have sex some of the times, it changed not only their sexual relationship but also transformed them emotionally.
Brown told Heckel:
"It's a very powerful and unique act," he says. "I think in the context of a relationship, it can really add an almost spiritual shine to the relationship."
When he talks about the "spiritual" dimension of sex, he isn't talking about religion, but rather something primal, something natural.
"There's definitely an electricity. A sort of flesh-to-flesh electricity that happens," he says. "We also found the more we did it, the stronger that electricity was. There's something there beyond just kind of having sex. It is beyond just pure pleasure."
Sex is the thing that keeps couples together. It's what creates and maintains the bond. In my experience, it does get harder and harder to find time to connect in bed, but it's a really necessary part of being with someone.