She objected because...

...he soon resumed hobbying leading her to threaten to cut off his head next time.  The doctors felt this would be harder to replace. Ah what they leave out in these stories!

I mean, 10 cm is just under 4 inches!


Light

"Cowards can never be moral."
M.K. Gandhi

Maybe it didn't look too secure?

Having it pop off during game-time might end both of their sexual careers.  The mind shudders at this thought.  I'm certain she did, too, probably moreso when she saw it.  

Even if the doctor called his work a success, he wasn't going to fuck the patient to find out.