I don't see why there wouldn't be female KW fans. There is nothing 'male' specific about the music they make, perhaps only The Man Machine mentions 'Man', but in German the lyric talks about a 'Mensch' (human). The word 'Man' in Expo 2000 should be understood with the same meaning, I think.
 
I once read a theory that The Model was their most popular track because the song combined 'tech' music with 'human' lyrics'. This way of thinking links 'tech' with male and 'human' with female. I'm not too sure.
 
Apart from those tracks, only Sex Object has remotely to do with gender.
 
So there are no clues or messages to make KW and all male boys club. Why shouldn't women and girls like good music? I presume that KW fans come in all shapes, sizes, genders, colours etc. And I for one, am very pleased with that.