It's just that one night a new friend will come out of your anus. You can give it a name, feed it, play with it ... and even, just imagine, not tell your parents about its existence. This something from your anal sex will be like a puppy, only a worm. Therefore, if you do not want a meter worm as your pets, it is better to wash everything that has not been heat treated.
An acquaintance of mine worked at the AIDS Center, he said that immunologists once a year buy a couple of kilograms of prunes and eat it unwashed, of course, after such a reception they sit on a pot. By doing this, they raise their immunity, but I don’t think we should abuse unwashed vegetables.
Any infectious diseases such as dysentery, cholera, typhoid fever, salmonellosis, plus many parasitic (worms in the first place) ..