From a bit of completely scientific research (meaning, google), it looks like 4% of the population is lesbian/gay, 5% is bi, and >1% transgender, making up for roughly 10% LGBT.
bi is wayyyy too subjective of a definition
for example, my girlfriend has had sex with a girl, but is not "bi" because 1). she would only go down on a girl to enhance sex with a guy and 2). she would never consider dating a girl
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SephirothG, channeling awesomeness from Mershiness.
The Resurrection