Guys at 65 - 75 kilos are pretty common in an awful lot of countries, they also have a lot more physical strength than ladies of the same weight, whats the problem.
I for one would definately vote against the F16's entering the Olympics, the Viper as a SMOD would be another matter. The Viper being selected would leave the semi development class as it is and allow all the development in sails and hulls to those who want to do just that, develop the class whilst the Viper class would remain the Viper. Best of all worlds for all concerned.