I've searched around a bit, but haven't really found anything about this..
A few times now, I've filled my diaper with baby- or olive oil. Baby oil is actually nicer, as it's got such a great smell. The whole thing gets slippery and it's incredibly arousing. Has anybody ever done that?
And another question; would it be any health hazard to fill a diaper with baby oil once, and then fall asleep with it? It would be an awesome experience I think, but I wonder what it'd do to my skin.