Question

which fertility control method is highly effective and has no health related side effects associated with it

Answer 1

The most effective birth control measure is Abstinence.

Abstinence is the only form of birth control that always prevents pregnancy. Practicing abstinence ensures that a girl will not become pregnant because there is no chance for sperm to fertilize an egg.

Many other birth control methods have high rates of success if used properly, but they can fail occasionally.

Abstinence doesn't have any side effects because it doesn't use any medications like other birth control measures(pills) and allergies (condoms and diaphragms).