Either way.. why risk it. Like there's nobody monitoring what you're going to upload?! Why would they want to get into trouble for something you want to save.
Put it on a jump drive or burn a cd and save it if that's what you really want to keep laying around.
If they're so risque' why do you want to put them somewhere else, so they would take the responsibility of getting caught with something?
Own up to it and put them on your hard drive for safe keeping and secure the file. Its as simple as that, I also believe there are apps in the market that will help lock a file on your phone if you're that worried about someone inparticular finding out about these pictures.