Ooo ... that sounds like it may be something altogether different in my opinion. When my Major Depressive Disorder was at its worst, then sex was too much work as well (so was getting out of bed and doing things like eating or bathing).

You might want to talk to a therapist or counselor about that. It might be a sign of something else being wrong. Sex should be fun, like playing basketball with a friend or going to the movies, it shouldn't be work. If it becomes work, then there's something else gumming up the works.