The male form is unique and can be a challenge to accurately draw. This is a good reason to download or purchase a male pose reference to assist with artwork. Not only are these models a work of art in themselves, they can greatly assist with anatomically correct drawing. An amateur often starts with a wooden model, but then becomes capable of drawing in three dimensions if given a model on a paper. Progress to the next level.
The male body ranges from lanky to muscular to obese. Difference references can be useful for the challenges of drawing different figures. Many amateurs practice drawing fairly athletic models because they are the standard form for athletes and comic books characters. Someone wanting to draw realistic scenery might have to draw an older or more obese person, so it pays to have different models available.