A very philosophical discussion... do we, as men, supress our sexual desires and thoughts based on social norms, and if so is this a bad or unusual thing, or actually constructive for living harmouniously.
For example you could perhaps argue that you have been socially conditioned to think that having a gender preference is wrong and that you should think about same sex relationships with an open mind.
Personally I think it is a complex issue, which cannot so simply be explained away by "social conditioning" or similar pyschology. Every one of us is very different, we have different genes, different experiences and conditioning, different environments, and beyond that different levels of spirtuality (not talking religion here, more broad view on spirituality).
So my view is that I think it is quite possible for someone to go through life and honestly not have sexual thoughts about the same sex. While another thinks about both equally, or another has nothing but same sex feelings and thoughts.
The problem I think comes about when we start using these labels (and really labels are just language devices to help us understand and communicate ideas) to say that one person is wrong or bad for being different. Whether that be because they are gay, or straight or bi.
This is my personal view, and I am very liberal in that sense.
An interesting side issue on the right and wrong and the sexuality thought thing... Would you feel so strongly if we we talking about someone having feelings towards animals or children for example? Yet I believe a case could be made that the suppression of these thoughts in some are caused by social conditioning (but I think you would find less argument as to the potential harm, and the percentage that would think it wrong... if not to think about then definately to act out on).