I have come to notice often when I am looking for models for my photo manipulation projects that it seems to me that there is an overwhelming larger number of really good female stock than there is male stock. Now don't get me wrong there are some truly fantastic and talented male stock artists. But when I am looking for male stock, and I want a particularly pose, and/or costume I often do find that there seems to be twice as many really good female stock models which fit exactly the style/look I am after than there are male.
Depending upon the project I am working on, sometimes I will get inspired by a good female stock model and use that even if I was originally looking for a male, but on some projects it is significant and important to the work, and what I want to convey to have a male model. An example being the most recent project I completed. The piece was a very personal and symbolic one so it was important to me to use a male model because it was crucial to the work and the meaning behind the piece to do so.
I originally was hoping to find a male model that resembled a Celtic Warrior, and though I hadn't yet a specific pose/position in mind they had to be in profile now forward facing. I found a vast amount of amazing female Celtic warrior stock that where posed and positioned in a way that would be perfect for what I wanted, but I had a hard time finding a good male that really fit what I wanted. I did eventually find a really good male warrior, who was posed in a way that was perfect for what I needed, though he was not specifically Celtic, still it conveyed the basic look I was going for.
But it is just something I find interesting when I am hunting out good stock for my projects.