Not all people who watch massive amount of pornography become transgenders. There are also a lot of people in frustrated countries like Iraq, Syria, Egypt, India, Pakistan and Bangladesh who haven't had sex in their lives so they watch a lot of porn. This doesn't mean that they are going to be transgenders. If you google which country watches more porn, I am sure Pakistan will come on top. I don't know why but people must be really frustrated there.
Yeah I agree not all people but because of their expoaure of that kind of sexual viewing they are more addictive that can cause lust for a person.