Sex therapy and sex counseling are two different terms but both means the same almost. You can think otherwise that sex therapy is a form of counseling where people focus on sexual issues, which can be of anything.
Sex therapist will help you to give a clear image of the particular problem and the goal will be to cure the issue. And even they find a better solution and also know the exact cause of it and try to overcome such causes in sex life.
Men suffering from sexual dysfunction or some other problems in their sex life are generally solved by sex therapist. They can ask questions, order some homework exercises or sometimes give direct suggestions just to get you out of the problem you are facing your love life