From descriptions of sex-tracking apps included in “Quantified Sex,” an article by Deborah Lupton, an Australian sociologist, that was published in the April 2015 issue of Culture, Health & Sexuality.

Sex Partner Tracker: Users document number of partners, geographical location, and the frequency of sexual activity. The data then allows users to determine “who is the lover with the highest score within your region/world.” The app also purports to demonstrate who among its users have had sex with one another.

Sex Stamina Tester: Users place their smart device on their beds and measure sexual stamina (how long sex lasts). This app…