" According to a 2013 survey by Harris Interactive, 20 percent of Americans, 18 to 34 years of age, use their cellphones during sex, generating a new meaning for the expression coitus interruptus."
As per PC World:
" . . . "Larry Rosen, a research psychologist at California State University who studies smartphone use among college students, says . . . that most college students are “heavy users” and that his experiments show that their heart rates and other vital signs actually spike when they can’t use their phones, in response to increased anxiety and distraction."