Would you prefer to do it the hard way?
Sure. Why not? The name of the conditional that I just deleted is "j00_c_pcmale". There's also a "j00_c_pcfemale". You could try to extract all DLG files with JEFindRes and search for these strings in them. There may also be other scripts that refer to the gender... They most likely use the GetGender() function. You could extract all NCS files with JEFindRes, transcode them to PCODE with nwnnsscomp and search for "GetGender".