First, there is no established human right to “sexual orientation” at international law — it is a contested proposition. There is no United Nations (UN) treaty which expressly underwrites discrimination on grounds of “sexual orientation”, itself an ambiguous term.
Attempts to read “sexual orientation” into “sex” (a biological term) in interpreting treaties such as the Covenant on Civil and Political Right are controversial and not universally accepted. While certain UN bodies/officials prefer an expansive reading of “sex” as encompassing “sexual orientation”, their opinions are not legally binding.
Marriage & Family 