What are sexually transmitted diseases

What are sexually transmitted diseases? List two examples of each disease caused due to bacterial infection and viral infection. Which device or devices may be used to prevent the spread of such diseases?

Answer:

Diseases which are transmitted from an infected person to a healthy person due to unsafe sex are called sexually transmitted diseases.
Two examples:
Bacterial disease: Gonorrhoea and syphilis
Viral disease: Warts and AIDS
Preventive measures: Use of condoms or similar coverings.