Hi and thanks for writing JA
She is trying to look attractive, alluring, desirable but is too young to understand that she does not in her photo.
Let me know if you have other questions so you can be certain you get your moneys worth.
She thinks/thought her photo looked attractive to men. That is your expert answer. She was wrong of course but that was her intention.
No it does not imply that she was sleeping with a guy. It implies that she was trying to be provocative.
Let me opt out and allow other experts to weigh in on this for you> I hope you find that which you are seeking.