Your brother is sitting next to your female friend, and you are praying he says nothing stupid. Out of his mouth comes "What's your mass, my little friend?" 

You are mortified, because then he says "I have a mass of about 75 kilograms, and I am guessing you are no more than 69 kilograms, so, scientifically speaking, I find myself attracted to you!"

Calculate the force of gravitational attraction if their centres of mass are 0.85 meters apart, quickly, before your friend slaps him.