He just rolls over and falls asleep after we have had sex

Q. I am in relationship with a separated man for a year. We are getting on well and have lots in common, but the sex has become routine — once he reaches a climax, he rolls over and falls asleep. I find it difficult to imagine a long-term relationship with him, when our sex life is so flat. We are both in our late 30s.

A. It’s always important to question your relationship, particularly in the early stages. Many people in long-term relationships report that they find sex less exciting and that it is all very predictable, but you both are together for just a short time.

In the beginning of a relationship, sex and intercourse are more frequent, but, with time, this frequency often declines. You have reached a challenging time in your relationship. If sex was out of the equation, would you have any doubts about being with him into a long future?