It is a lot of fun when you and your partners love this type of play but why do articles skip the most important of prerequisites: the cleaning out. I worked at a gay and bi dating site in Cambride MA and learned through a poster and many of the how to articles that customer service had for answers that fingers require a good 15 seconds of water cleaning with a hot water bottle and hose. Whereas dildos and penis penetration required 45 seconds of filling your cavity and draining to prevent any code browns.
Like Snoggy the Bear says, "Only you can prevent code browns, only you!"