Sampling methodology...
Cannot be sure, but did they sample the same people over multiple parties -- both themed and non-themed? If they did not (and at an average of 19.7 people present per party, it seems likely that they did not), is it not possible that women of the more 'extrovertial / gamey' inclination are more likely to attend sexually-themed parties than the rest, and by the same token, more likely to be heavier alcohol consumers than average (even the average male)? I know more than one or two females who can put away more vodka than most blokes I know.
Biting the hand that feeds IT
