The reason the creeper has an appetite for men
He is a male after all, and I think I'm the only one who picked up on this, but the creeper obviously consumes men the most for their reproductive organs (penis, etc.)
Think what you want, or that I'm reading way too much into this but this screenshot I have from the film proves it. This screenshot was taken from the first film when Darry is staring at the ceiling with all the dead preserved bodies all over the place down in the cellar. Notice the body of this male victim on the ceiling, look closely, he's CLEARLY missing his reproductive organs, so the creeper obviously consumed them for his benefit and enclosed the wound before preservation
http://i55.tinypic.com/mwrx1l.jpg
http://i55.tinypic.com/mwrx1l.jpg