I snapped to attention the first time I heard the term "service sex." I heard it in 2017, from a researcher at an annual sex researchers' conference in Montreal. This expert was describing straight women who were distressed because they didn't feel desire for their husbands or long-term partners. Wanting to keep their men happy, these women often had sex anyway, with a resigned attitude and little thought to their own pleasure. The mere existence of the term "service sex" suggests it is common enough to need a name. Several therapists I interviewed while researching "UNTRUE," a book about female...