couples dressing like men?

I was just wondering why most s look like men and their partners look like men too? if they are attracted to women then why have a gf that looks like a bloke, why not just be with a bloke? or do they like the look of guys and the girly parts? ive got a frend like this and wen i asked her she didnt know, shes butch herself. she dosnt perve on men but perves on women who look like men, im not trying to offend anyone i just wondered if anyone knew,