Unlike prophylactic birth control, the morning after pill does nothing to cure or prevent VD. As VD is a medical issue, no one selling morning after pills would no you had one unless you told them, they couldn't charge you more for them. However VD is one of the best reasons against the morning after pill. Far too many women opt for it because convenience.
Prolly says something unpleasant about me that I have a closed loop: unprotected sex-unwanted pregnancy-venereal disease. Also long time BFF and sign other would neck me if I mention Halmark Day One of many. As a professional cad back in the day, however, I should like to think that, since VDay is scheduled preventative birth control is planned as well, rather than the emergency solution. I would think that an event like Coachella or Burning Man would push such demand.