Which version of LaFemme are you using? The version of LaFemme that is in the scene when you open poser is a light version. If you select the body of this one you will see a Lhomme morph dial which if you turn to 1 sets her to lhomme (but without genitals) If the morph isn't there you need to make sure you have the VERY latest version of poser and support files.

However as you say there are morph files in the pose folder I assume you have bought LaFemme pro and lHomme pro.

In the character folder you will find these figures. LHomme has 4 choices, locked and unlocked (ie you can't dial out the morph) with and without genitals. There is also the LaFemme pro figure in the character folder.

LaFemme doesn't have a huge amount of body morphs as such but you can achieve a lot with scaling and linear translatiions of body parts, and there are separate morph packages available. To use the morphs on either figure, just select it, inject the morphs from the pose folder and dial in as required on the figure.