can excessive sitting cause premature ejaculation?

Good day. excessive sitting is NOT one of the premature ejaculation causes. The problem that you are dealing is something else, I am sure. For example, let me get a clearer picture of your problem - I assume that you are sitting a lot at your work. Well, your job, in that case, can lead to stress. On the other hand, stress is one of the biggest cause of premature ejaculation. So, as long as you are dealing with this, you will have problems with ejaculation. Try to find causes to treat them, that is the only thing that can help you.