the total enrgy after combustion will be 60C^2 provided that the half the energy is used during the mating process , to over come the energy , and recharge in full one should have 1/2*60C^2/C^2 , that is 30 kg of chocolate which means after each sex, one should consume half the mass of chocolate as their body mass... still in the process of revision ,,,,,, any suggestions ? welcome...