You should ask the surgeon for the official answer. Personally, I wouldn't have risked it; Brassard was very insistent on keeping everything *scrupulously* clean for that two-month period, and even a bowel movement required sanitizing everything (from me to the toilet itself) to a ridiculous degree. The major concern isn't damaging the tissues, it's infection.
With that said, there *is* also the risk of anal-vaginal fistula. While I think that is most often caused by stress or pressure on the vaginal tissues, I wouldn't want to take the chance that putting strain on the area from the other direction would cause fistula either. It's a really nasty, often difficult to treat complication, and people have ended up both entirely losing the vagina and having to use a colostomy bag for life.
