If you want to know more about which the international human rights standards are in connection with sexual orientation and gender identity, give a look to the enclosed link, in which you will find a document elaborated by the International Commission of Jurist (ICJ) in 2006. The ICJ is a prestigious global network of judges, lawyers and human rights defenders united by international law and rule of law principles that advance human rights.
Enjoy the reading and remember, the first step in the fight against discrimination is be aware of it!
Documents:
http://data.unaids.org/pub/Manual/2006/070517_icj_un_references_en.pdf