To solve this problem, we need to analyze the defined actions of different contraceptive methods and identify which one does not match its described action.$\newline \bullet$Option 1: Barrier methods - Prevent fertilization$\newline$ - Barrier methods, such as condoms and diaphragms, physically block sperm from reaching the egg, thus preventing fertilization.$\newline$ - This description is correct.$\newline \bullet$Option 2: Intrauterine devices (IUDs) - Increase phagocytosis of sperms, suppress sperm motility and fertilizing capacity of sperms$\newline$ - IUDs are known to create an environment that is hostile to sperm, increasing phagocytosis and reducing sperm motility and fertilizing capacity.$\newline$ - This description is correct.$\newline \bullet$Option 3: Hormonal contraceptives - Prevent/retard entry of sperms, prevent ovulation and fertilization$\newline$ - Hormonal contraceptives, such as birth control pills, primarily work by preventing ovulation. They may also thicken cervical mucus to prevent sperm entry.$\newline$ - This description is correct.$\newline \bullet$Option 4: Vasectomy - Prevents spermatogenesis$\newline$ - Vasectomy is a surgical procedure that involves cutting and sealing the vas deferens, which prevents sperm from being present in the ejaculate.$\newline$ - It does not prevent spermatogenesis; sperm production continues in the testes but the sperm are not released.$\newline$ - This description is incorrect.$\newline$Therefore, the approach that does not give the defined action of contraceptive is Option 4: Vasectomy - Prevents spermatogenesis.$\newline$The correct option is Option 4.