Most sex manuals, past and present, do not enumerate more than forty or fifty coital positions - and much depends upon semantics. Here again there are few ground rules. If, for example, you shift a leg a couple of inches does it count as a new position? In one nineteenth-century work a sexologist, D. K. Forberg, claimed that there were no less than ninety positions for sexual intercourse. This has been claimed as one of the highest estimates ever made. As a note to "The Perfumed Garden" Walter remarks that Forberg restricts himself to the positions assumed in ancient Greece and Rome. Presumably if only slight variations in position qualified as a different kind we could think of literally hundreds of coital possibilities.