<p style='text-align: justify;'>Chapter 9, sections 13-18 of an unidentified medical work. This chapter focuses on sexual illnesses. Section 13 deals with causes of infertility, premature ejaculation, impotence and provides advice on how to increase the amount of sperm. Section 14 deals with spermatorrhea - a condition of excessive, involuntary ejaculation. Section 15 deals with priapism. Section 16 deals with aids for conception. Section 17 deals with contraception. Section 18 deals with diseases of the penis.</p>