" Take one girl - sweet and serious. Take one boy - sweaty and sporty. Add one beagle, an impetuous younger brother and a dash of misunderstanding. Stir well... Mia thinks boys are immature. They only use one per cent of their brain. They only ever talk about cars and sport. They only ever think about sex. Will has no idea what girls talk about. He wishes he had a tape recorder and a hidden…