If you are an adult and you need to wear diapers then it usually has medical purposes. Besides that there are people who wear it for pleasure and some of them become even sexually eroused having a diaper on. Mostly adult men like wearing diapers. Yes it may seem sick but these people actually like the feeling having a diaper on. Not necessarily to defecate in it, the reason for wearing it is usually not associated with infantilism or medical reasons as previously mentioned. I tested some adult webcam sites if there are models wearing a diaper for my request and all girls denied it but some male performers did it. Be careful as some live sex sites do not allow models to wear disapers as they relate to underage contest and they might ban the model and you also. Check out the rules of the sites first of all if it is prohibited or not.