Making Orgasms Painful

Found on some forgotten part of the web:

One very easy way is the ‘fucking-pole’ we have. It is a wooden plank,
mounted on the floor and standing up. At cock-hight there is a hole in
it, about one inch wide. The size of the hole is such that i can puch
my penis through when it is flaccid. I then must fuck the hole. When my
penis becomes erect, it becomes very difficult to move it to en fro,
and when my penis swells to ejaculate it becomes stuck. It took us
several experiments to find the exact diameter, but now it worked
perfect. Very painful and very frustrating because i can’t move when
it is most important.

My Mistress wants to learn me more control to withhold my orgasm. For
training this we use electrodes. I get a rubber ring around my dick,
just behind the head. At the underside there is a small piece of copper
that is the first electrode. The second electrode is a little copper
plate just in front of my dick, attached to the rubber ring bit a piece
of wood. When i start to ejaculate my cum closes the circuit and i get
a very strong shock that seems to reach my balls (several 9.5 batterys
power the system). To make me cum with this we use a penis vibrator. I
am never allowed to fuck or masturbate.