Mollies How Can You Tell Sex

[creamo098765]

I have 3 mollies they all get on fine but one is all ways being chased it has a white belly and bodys black the other to are all black.
How can u tell there sex

 

[emma12321]

Hi,

Males have a gonopodium instead of the normal fan shaped anal fin. This link shows a pic http/www.fishforums.net/index.php?showtopic=46309 its a link for platies as the molly link isn't working for some reason, but they are sexed the same way.

Emma