If the end goal is trust, are you open to the possibility that building a healthy sex life with a committed partner is another way to build trust? Trust that you can open yourself up in the most vulnerable way to another person and they will honor and respect you. Trust that your needs and desires are equally important as the other person's needs and desires. Trust that you can talk openly about your bodies and not be ashamed. I've never tried NOT having sex as means of building trust in a relationship - I've always been lucky enough to experience sexuality as a trust-building component of a growing love between two committed people. I'm looking forward to marrying my partner of over 4 years in just a few months :) - we've been living together for over 2 years. I completely trust him. I'm not sure I would feel the same way if we did not have the intimate relationship that we do now... although I am open to the idea that some folks have built that trust minus the intimacy.