All of the following are clinical manifestations indicating male climacteric except:

Male climacteric, also known as andropause, is a stage in a man's life characterized by a decline in testosterone levels and various physical and emotional changes. While men may experience symptoms like hot flashes, headaches, and heart palpitations during male climacteric, they do not typically lose their reproductive ability. Although fertility may decrease with age due to reduced testosterone production, men do not entirely lose the ability to reproduce. Therefore, the correct answer is 'loss of reproductive ability.' Choices A, C, and D are symptoms that can be associated with male climacteric, making them incorrect answers.