Interestingly, the rates of vaginal intercourse among teens don't seem to have been explored as part of the study. Don't see that mentioned in the discussion he

Interestingly, the rates of vaginal intercourse among teens don't seem to have been explored as part of the study. Don't see that mentioned in the discussion here either. Seems an important question. Are they actually getting pregnant less per occurrence of vaginal intercourse, or are they simply having less vaginal intercourse?