These two might be saving themselves a morning trip by picking up the Plan B before the prom instead of the morning after. That's some smart thinking. I'm just kidding, of course. We all know that prom is often connected with people's first sexual experiences, even if it is a little awkward to talk about. Either these people were making a fun joke with this photo, or everyone involved is very oblivious. At least they can crop the picture, but then you still run the risk of someone seeing the picture and saying, "I recognize that building! That's Planned Parenthood!"
For real though, never be embarrassed about exploring sexual health, especially leading up to prom. It's better to be safe and knowledgeable than to end up with an STD or pregnant just because you were too afraid to get advice.