Never, never, never take pictures of yourself naked and share them, even if everyone else is doing it.  Having an explicit picture on your phone of someone under the age of 18 is considered child pornography and can result in a jail term or being placed on the sex offender register. One 14 year old boy downloaded a video of a girl his age having sex and shared it with students at his school.  He was charged with child pornography offences.  For more information checkout the Lawstuff Australia website.