CIS scholars have previously reviewed this topic in comments of porsts' past. With that said, I decided to take another look at the mechanics of whole-handed self-penetration.
Full Disclosure: I've had 4 rum and cokes at a party. I also downed 2 cherry mash bourbons.
A porster would need exceedingly long arms or the ability to dislocate your wrists in order to get the chevron formation of one's hand in the right position. Absent the circus freak abnormalities I've laid out above, a porster would merely only be able to press the starfish with a bottom-handed closed fist. Hardly the ideal for anyone to include stretched talents of say a Bella Donna or Animale.
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I hope this clears the topic up once and for all.
You are welcome.
*
ALWAYS a funny comeback