Guys and gals, What is the real deal with safe sex and timing it so there is the least chance of pregnancy? I've asked so many people.. So many different ideas. The most common one, that my physiology teacher agrees with, is that one week after the girls period ends is the most dangerous time (highest chance of pregnancy.) They say to leave a 1 or 2 day window on either side of that 7th day to be extra safe. By period ending, I mean the bleeding ceases. What do you know?