Name one sexually transmitted disease for which no definite cure has been found so far. What is the causative organism of this disease ?

What is gestation period ? How much is the gestation period in humans?

Name one method of contraception which also protects against sexually transmitted diseases.

What are the three types of methods used for birth control (or regulating child birth)? Give one example of each type.

What is the name of surgical method of birth control in human males in which the sperm ducts are cut and ligated (tied) at both ends?