Buggery with a difference:
Normally done whilst buggering a young lady (typically
one who rides side-saddle).
The young lady ingests a piece of ham or bacon tied to a fine thread, which the
man holds whilst buggering her.
As the
man is nearing ejaculation he pulls the thread, along with the attached piece of
meat, which causes the woman to heave (convulse).
A side effect of the heaving is for the sphincter to contract violently around the
man's penis, thus hightening sensations and giving a more powerful ejaculation.