is defined as various ways used to prevent pregnancy from occurring. has been a concern for humans for thousands of years. The first contraception devices were mechanical barriers in the vagina that prevented the male sperm from fertilizing the female egg. Other methods of that were used in the vagina were sea sponges, mixtures of crocodile dung and honey, quinine, rock salt and alum. We have come a long way from past time times of contraceptives, although some of the same concepts are still used. The least effective form of used today is ....