Audio erotica is a response to power imbalances and sexual domination often seen in visual pornography. Before these apps existed, Reddit threads and the back alleys of Tumblr were often used to create erotic audio content particularly made by and for women.
No one wants to get cheated on, but there seems to be a pattern of it when it comes to business trips. Many husbands and wives cheat while traveling for work because they want a break from themselves.