Quote:
Originally Posted by
Fuuma 
Is that one of those Hellfire club, make some additional holes to accommodate more joyful revelers kind of thing or do you mean the more the merrier but we'll do with what we have?
No, the allusion is simply to a woman with sufficiently large breasts that one can properly TF her. I owe the term "four-entry" woman to Tom Leykis, to give credit where credit is due.
As a matter of historical interest, Procopius in his Secret History mentions that the Empress Theodora in her pre-empress dancing girl days was reported to have lamented that she wasn't sufficiently endowed to permit such activities.