I believe transgenderism is real - probably something in brain structure and/or chemistry that results in a female-patterned brain in a biologically male body or a male-patterned brain in a biologically female body.  I am no scientist, but I would bet dollars to donuts that this brain structure/chemical divergence from the biological body takes place in utero.  

HOWEVER, I do agree that as a society, we have been too quick to embrace this idea of dozens of sexual orientations and gender identities.  I am not going to make any friends in the LGBT community by saying this, but I think it is simple, base arrogance (like a child that is raised in an overly permissive home) that has caused individuals to expand these categories and definitions beyond all common sense and scientific fact(s).

From what I know through anecdotal evidence and multiple courses in human sexuality, variations in human sexuality (there is such a course offered at SFSU), a cluster of courses focused on LGBT issues and basic biological science - there is heterosexuality, homosexuality and a spectrum of degrees comprising bisexuality.  As for gender, I believe there is biological male, biological female, intersex individuals/genetic mosaicism, and transgendered individuals (a male oriented brain in a biologically female body or a female oriented brain in a biologically male body). 

Hard to argue with DNA and decades of medical science.

Marc

Please don't let me prefacing my post with "I believe transgenderism is real" as saying that you didn't.  I was simply starting my post wanting to be clear as to where I find myself on that particular issue.  

Thanks!

Marc