I don't believe that a mere preference can be viewed as a sin per se.
According to Church doctine, since the Fall, Man has had an innate tendency to sin. That, alone, is not an offense against God. However, acting on those tendencies can be considered sinful.
I am not an authority on Catholic doctrine, so please forgive me if I've mistated the matter.
Regards,
You are if you are Catholic. It’s right in the catechism The easiest thing to google in the world.
http://www.vatican.va/archive/ccc_css/archive/catechism/p3s2c2a6.htm
Yeah, I’ve had about 4 others point that out. My goof. :) Thanks for taking the time to address this.