"Three Men In A Sauna" joke

Three men are sitting naked in the sauna. Suddenly there is a
beeping sound. The first man presses his forearm and the beeping
stops. The others look at him curiously.
"That's my pager," he says. "I have a microchip under the skin of
my arm."
A few minutes later a phone rings. The second man lifts his palm
to his ear. When he finishes he explains, "That's my mobile phone.
I have a microchip in my hand."
The third man, feeling decidedly low-tech, steps out of the sauna.
In a few minutes he returns with a piece of toilet paper extending
from his ass. The others raise their eyebrows.
"I'm getting a fax," he explains.