I do keep boys together but in strict circumstances ie they are brothers and have been together since birth I have 3 in one run, or they are exceptionally laid back piggys like griffen was, or they just get along as Scrappy and demon do, BUT I do have 2 pigs that will not share and they are in between other runs alone so they can see feel and touch others for company funnily enough these two pigs love adult company patch ( patchypoo) and dobby, I occasionally try them with others but as of yet no luck and I certainly would never risk harming any of them in doing so, in other words yes it can be done but only in certain circumstances and you need time to watch and wait