17 books
Letters to Penthouse XXXIV
Letters to Penthouse XV
Penthouse Unleashed
Penthouse Uncensored
The Penthouse Erotic Video Guide
Letters to Penthouse XXV
Letters to Penthouse XXIV
Letters to Penthouse XXIII
Letters to Penthouse XXII
Penthouse
Letters to Penthouse XVII
Letters to Penthouse XVI
Letters to Penthouse XXXI
Letters to Penthouse XXX
Letters to Penthouse XXIX
Letters to Penthouse XXVI
26 Nights