By all means pay excellent attention to building your muscle and getting your life in great shape, but at some point, you just have to say fuck it… and trust that your partner isn’t out to sneak some on the side as soon as you stumble for a moment. Obviously choosing a partner well is part of that decision matrix and having them on board with positive relationship standards matters too. But at some point you have to trust.
http://marriedmansexlife.com/2013/05/why-you-need-the-blue-pill-too/