Birth Control Failure is more common than most people think. Our birth control chart shows the failure percentages for each birth control method.
americanpregnancy.org
This is a very long list, so I'll list a few. Percentages are failure rate.
Condom (male ) 18%
IUD (copper) 0.8%
Oral contraceptive 9%
Sterilization (female) 0.5%
So, even taking the safest of these there remains some risk. And not all contraceptives are available to all women (I didn't list the risk factors).
Of course the safest of all is abstinence (0%) but I doubt you feisty Italian women would choose that.