Some diseases are the result of intrinsic failures of the system. Others are the result of damage by other organisms.
Sex is also a prominent means of transmitting diseases.
The diseases can be prevented through a variety of precautions. Many diseases can be prevented, controlled or cured. Sexuality is basic to the physical, mental and social development of humans. Students should understand that human sexuality involves biological functions, psychological motives, and cultural, ethnic, religious and technological influences. Sex is a basic and powerful force that has consequences to individuals' health and to society.