"The Roman Catholic Church allows certain “natural” birth control practices (rhythm method and coitus interruptus), but rejects as sinful the use of artificial contraceptives. This perspective did not develop in a vacuum, but has its origins in the theology of Augustine (354 – 403 A.D.) and Aquinas (1225 – 1274 A.D.). Even though neither theologian directly addressed the issue of birth control, both did much to influence the contemporary Catholic view of the meaning and purpose of sex within marriage."