Maybe you've just learned your partner watches porn, and now you're upset and wondering how to deal with it. Or maybe you're the one watching porn, and you're wondering if watching porn in a relationship is unhealthy. Here's what scientific research and sex therapists tell us about how porn affects relationships and why people watch porn when they're in happy relationships. Porn is not necessarily bad for relationships. It can be bad for some people and for some couples, depending on how it's used and how each person feels about porn use. Watching ethically produced porn and masturbating to it can be a healthy, harm-free part of a person's sex life, whether they're single or in a relationship.