Some people believe they are unfaithful, cheating, and breaking their marriage vows if they have sexual fantasies about someone other than their own spouse. Sex therapists state that having sexual fantasies, either about one's spouse or about other partners, is normal and healthy.
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There appears to be quite a bit of evidence that sexual fantasies are not a sign of sexual inadequacy or deprivation, but are a sign of a healthy, happy sex life.
Fuss
With more books and articles being written about sexual fantasies being a harmless addition to a person's sex life, conservative and some religious leaders are expressing concern that marriage relationships will be damaged with the more lenient attitude being expressed about sexual fantasies.