Where is another "hand" that go into the ass

A man with stomach pains goes to the hospital. The doctor tells him it's constipation and that he'll need to use suppositories. The man is instructed to drop his pants and bend over, whereupon the doctor shoves the tablet up his behind.

"You'll have to do the same thing every six hours for a week," says the doctor.

Later that evening, the man is having difficulty inserting another suppository and decides to ask his wife for help. He tells her what to do, then drops his pants and bends over. She proceeds to put one hand on his shoulder and with the other shoves the suppository home.

"Damn!" screams the man.

"What's the matter?" she asks. "Did I hurt you?"

"No," he replies, "but I just realized that the doctor had both hands on my shoulder"

Tips: Where is another "hand" that go into the ass ?