NJS asked me this in a PM and I gave him a pretty shitty reply. Well, directly off the EWB Site, here's a better answer...

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"Only certain ladies will appear in Buck Naked Matches. Attitude and Behaviour are the factors that determine if they will participate and wrestlers will only participate if both of these stats are 30 or less. Without using the File Editor your best bet is to take control of XPW as a number of their women will happily participate."