What materials can be shared and sanitized?

Sanitization refers to the process of making utensils in restaurants safe for using. It requires a large industrial dishwasher...toys, generally, don't need this level of cleaning.
Glass, silicone, metal, some stone products, some treated wood products, and ceramic are fine to share after a good washing in hot water and whatever soap you use to keep your genitals clean. Now if you KNOW you have either a yeast overgrowth or bacterial overgrowth, or a virus then you can wash your toys in the top rack of your dishwasher (without detergent) providing they aren't motorized. A good spray down with a 10% bleach to water solution will do the same job as the dishwasher.

You want to avoid sharing porous toys, though you can, if you cover them with a condom at every use.