Some guy sent me a photo of himself with an erection, can he get in trouble?

This guy i know admitted to liking me, but he knows i have a fiance and 2 kids. I have no interest in him at all. We are only friends, well i wake up this morning to find a picture sent to me on Facebook of him with an erection. I am completely disgusted and appalled. Can I report him for anything such as sexual harassment? I scared he is getting obsessed and will go to any length to make me his