If the test subject is homosexual, then it would be inappropriate to test his behavior toward females. He must be tested against other males. You get the idea. Remember, preconceived notions don't have any place in the scientific method. It doesn't matter which theory is the most attractive.
Objectivity is necessary.
The U.S. Constitution was supposed to be a limitation on the powers of government. Instead, it has become a limitation on the rights of the people. That has happened primarily because people have accepted two ideas. The only rights they have are those which can be directly construed from the U.S. Constitution. No other rights are deemed to exist.