¿Nuestra orientación sexual la define principalmente nuestra noción de belleza, nuestro deseo, el objeto del enamoramiento o la mecánica del placer? ¿tendrían todos estos factores que coincidir?

I guess it is very influenced by the chemical balance of our brain, but when it is not biased towards one gender it could be influenced by environment. So, since it is a very messy and random process I do not think those arbitrary criteria should match at all.

Ask me anything. I deal better with "why" and "how" than with "what".