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?

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

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 females in which the oviducts are cut and ligated (tied) at both ends?

Name the contraceptive device used by the human males which acts as a sheath over the male organ and traps the sperms in it.