sex of a gouramis

Question
Iv just bought three gouramis two are blue dwarfs and one is a larger gold color how do i sex them?  

Answer
Hello Vanessa-

It's hard to do, but here are some pictures you can use for reference:

Males-
http://www.aquariumfish.net/images_01/gourami_neon_blue_male.jpg
http://users.kent.net/~lisab/goldgouramimale.jpg

Females-
http://k53.pbase.com/u12/colinbowler/small/2890094.DSCF0035.jpg
http://www.aquariumfish.net/images_01/gourami_neon_blue_female.jpg

Males have a "dished in" forehead, and female have big bellies and rounded fins.

Hope this is useful!
-Amber Worman