Not always but often when a pair of turtles mates, the male will leave his own shell and move in with the female. After doing so the couple will coordinate their arm and leg movements to walk and even swim.
I call this “Trying to get notes with false facts.”
I assure you, Facts-I-Just-Made-Up would never post false facts just to get notes. I also do it to confuse, misinform, and hurt people.