Quoting Martha Nussbaum

Martha Nussbaum has argued persuasively that our sense of ‘disgust’ gets tied in with morality and we come to make erroneous moral judgements as a result, for instance in condemnations of homosexuality:

I use the term “projective disgust” to characterize the disgust that many people feel when they imagine gay sex acts. What does that term mean, and to whom does it apply? The view I develop, on the basis of recent psychological research, is that projective disgust has its origin in a discomfort with one’s own body and its messier animal aspects, including sexuality, and that, in a defense mechanism, disgust is then projected outward onto vulnerable groups who are characterized as hyperphysical and hypersexual. In this way, the uncomfortable people displace their discomfort onto others, who are then targeted for various forms of social discrimination.