I'm not sure the name of it but I know eden has a toy that has an insertable part for the anus, vagina and a knob for the clit. So have you ever been triple stimulated (not with this toy, just in general)?
Their is a variety of toys that offer tipple stimulation and EF carries a good amount of these types of toys - from those with an anal probe, or vibrating anal probe or those that just stimulate the outside of the anus. SImply just search for "triple stimulation," and 4 pages of products come up.
I've never actually been triple stimulated/penetrated, but it's definitely something i'd like to try.