I think that the rectum is a much simpler organ than the vagina and training it to take large objects is most likely more straight forward and direct than training the cootchie. There are gay men that can take absolutely incredible objects anally... and there are some porn actresses like Abraxxa that only take huge objects up the butt. But this is coming from a guy that hasn't anything more than a thermometer stuck up my rectum... and that was when I was very little.
Mmmm, Alicia Rhodes.... :tongue: