Sissy is a term used to define a man who crossdresses as a younger woman rather than the traditional crossdresser. Mostly they are into the humiliation side of being forced to dress as a woman. This separates them from traditional crossdressers, as they see themselves liberating a hidden side and see it as empowering rather than a humiliating event.
Adult Babies and Diaper Girls
Diaper fetishism, nappy fetishism or diaperism, is a sexual fetish in which a person feels a desire to wear or use diapers. This is not due to a medical need.
Diaper fetishism is totally independent from pedophilia as the wearer derives pleasure only from the diaper and/or use of it. Being made to wear diapers as a form of humiliation is sometimes a behavior encountered in sexual masochism.
As of 2014, little analysis of this paraphilia has been reported in medical literature.