depression can alter your sexuality, your preferences, make you want it more or not want it at all. anti-depressants can do the same thing. Im kinda worried about the watching porn constantly thing. Do you think you might be addicted? That can also do a number on you. Its kind of like a chain reaction, same thing with smoking. When you watch porn it not only changes you at that exact moment but it changes your whole lifestyle. Like when a person stops smoking, they typically also become less promiscuous, curse less etc... its like your brain realizes that youre taking better care of your body and that signals a change in lifestyle. Porn does the same thing. Even if youre not into stuff like S&M or any of that kinda thing, watching porn can make you want that kind of thing. It sets off a chain reaction in your brain when you watch it that much. It can make you confused, it can put even violent thoughts in your head, usually towards women.

If you arent convinced with that (there is an article in another thread about porn explaining it better) then maybe you should just try with a guy. Maybe youre just curious. I know a few guys who, although theyre heterosexual, they don't like performing oral on a girl because they don't like all that either. Same thing with some girls don't like preforming it on guys even though they're straight. The not liking it thing I wouldn't really be too concerned about. I would mostly be worried that all your porn viewing might be doing something to you mentally. Just like any other addiction, it can change people. And often it changes people for the worse including making them like things like beastiality or violence against women because a lot of porns portray violence against women (whether you realize it or not).