Doing double duty
If you think of some of the rules that apply to a penis or a condom, many also apply to sex toys. One great example is that you should not put a sex toy that was just used for anal play anywhere near your vagina. That can put harmful bacteria in your vagina that can lead to an infection. And if a dildo is being used in a threesome so that one woman never feels lonely, that should not be then used on the other woman without being cleaned. You don’t want to spread bacteria from one user to another.