Production of sperm may lower immunity

A new study at the University of Western Australia has revealed production of sperm is more biologically taxing than previously thought, and expending energy on it has considerable health implications.
This study challenges the traditional view that sex, and sperm production, come cheaply to males. It is typically thought that females must invest heavily into reproduction, whereas males can freely produce millions of high-quality, tiny sperm on demand, with few costs. Study shows that the costs are in fact large, and these costs dictate how much effort a male will devote into any given sexual encounter