Yes, the male's face should be covered in bristles, the female should have little to no bristles, if they have bristles it will be tiny ones along the lip line. At that size it should be pretty easy to tell.
http://imageshack.us/photo/my-images/853/026bg.jpg/ heres what both of them look like. and i need some major help one of my plecos are missing i saw them both last night now today i only saw one i need some help it couldnt jump out cause the water isnt very high and there are not other predators in my tank other than a blue ram and he isnt agressive so where can he be can they bury them selves in the sand or no cause i really needa find him