I think both men and women are attractive. However, I only want to have sex with a female...so what am I?
You're straight. Your sexual preference comes down to whichever one you are sexually attracted to.
This. Gay/Straight/Bi/Pan/etc. being SEXUAL preferences, then comes down to only what you want to have sex with. Finding the same gender attractive is just being able to appreciate a good looking guy without necessarily being turned on by them.
About half a year ago I learned about a new sexuality, and learned that I align to it more than anything. Pansexuality.