I believe that people can be demon possessed but like others here, it is uncommon in civilized societies. I believe that what we mostly see in America is the reprobate mind or depraved mind spoken of in Romans chapter 1.
The mind controls all actions of the body conscious and unconscious. This would affect speech,muscle movement,thoughts and the thoughts on all issues civil or spiritual. So those with reprobate minds have a different perspective on life.
Those with reprobate minds can not determine right from wrong ,sin from acts pleasing to God or correct human behavior.
Thus a gay person may have a changed voice,different muscle movements and an opinion what they are doing is not wrong even in God's eyes.
Others may destroy people with their tongue, be greedy,or put themselves above others. These actions is much more common than demon possession.