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i try to look for the different between male and female from sexual organ. i think this is the best way as some female are hairly and some male have short moustache. i ever see someone post a topic like this with some photos compares between male and female from bottom view. i try to search from the tool but i am not good enough. so anyone please help.

I think you are searching for this one:

http://www.zebrapleco.com/forum/viewtopic.php?t=1626

thanks john