In calculating the efficiency of the contraceptive method chosen, the couple have to take several factors into account.
Most sexually active people use contraceptive measures to enable them to enjoy the mutual pleasuring of sexual intercourse, without the fear of a pregnancy occurring at an inappropriate time.
The couple will want to know which of the contraceptive measures available is the most efficient in preventing a pregnancy for their particular pattern of sexuality. It may be that the woman will choose one of the most reliable methods (such as the hormonal contraceptives or the I.U.D.) despite the side-effects. It may be that she will choose a slightly less efficient method (such as the vaginal diaphragm) which has few or no side-effects. This choice may be made as a woman grows older, when her fertility is reduced, secure in the knowledge that should an unwanted pregnancy occur she can obtain an abortion with safety.
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