I tried using a tenis ball a few times and others have had success with those. I must say you guys must have large undercarriages and your perineums must be like pliable playdough to allow that not to cause agony. What kind of 'globe' did you use?
A hard solid plastic ornamental globe. But I placed it on a couch cushion, and sat on it, so it had a lot of “give”. Wasn't hard or uncomfortable at all. I guess I am still experimenting.