You’re both desperate to save this marriage, so you have to be willing to try anything to make it work. You might not always feel comfortable with what happens, but it’s important to give it a chance anyway. The advice I’m giving you is something I’ve gone over again and again to be sure it’s right for you. The problem in your marriage is that you’re not giving her the pleasure she deserves. You have sex, finish, and she’s left unsatisfied. She deserves pleasure too, and to give her that, she’ll need to find someone or several someones who can show her the good time she’s been craving. You will not interfere in this, and you will not complain. If you want this marriage to survive, you need to make sacrifices for it.