Again, no sexual motivation of any kind.
Simply because a person is of AGE#<18, does not mean they don't have a sexual identity. I am not interested in that kind of answer anyway. I simply found the picture to be sufficiently bombastic that I had a wtf moment, and wanted clarification.
Were they just goofing off for the camera? Was there a funny story to go with it, like a dare? Does it represent some facet of their personality?
Seriously, other people are complete enigmas to me in these respects, and the question was literally that 1 dimensional. Any "sexual" content you may interpret from that is purely a fabrication of your own orientation bias.
Me? I have pictures of me wearing a dress in highschool for "switch day" on "spirt week", that are outrageously funny, but in no way imply anything about me, other than that I like to joke the same way anyone else would.
If a bit off color, no perverse intent was implied. (Again, to me, all sexual signals are equally dirty. I find marilyn monroe's famous "vent pic" as risque as frankfurter from RHPS.)
I understand that it is very hard to understand that I basically have no impulse, and thus may say akward things. Just remember that what you may instinctually think I mean, I almost asurredly don't. If it helps, imagine me as a robot without any parts. I have just the same degree of libido, and "innate" sexuality.
I take it you have seen startek TNG? I am commander data, but with a sense of wry humor, and emotions. I am every bit as clueless about human sexuality.