At first I apologize because my English is bad. I am a man at 45 years of age. I've produced a precum normally when excitement. But several years ago my penis suddenly no longer produces precum never. Whatever excitement and pleasure. And since that time I see calloused pieces with semen.And i began to feel the pleasure of ejaculation became less. Sometimes I feel like I did not toss. Although the emission of semen. Please answer and thank you