I like to spend time with my partner, sometimes sex is included in that, sometimes its not. After 5 years, I cannot understate the value of having someone you can sit in utter silence with an be completely comfortable, even comforted.
We are both in very high stress jobs, and sometimes we just sit. One of our favorite things to do is to sit and read together in the still house. Sometimes even our beautiful little cat gets in on the act.