“enactment of a law criminalizing homosexuality has the potential to engender violence against persons on grounds of their actual or imputed sexual orientation, and also to drive this group of persons vulnerable to HIV/AIDS underground, thereby creating an environment which makes it impossible to effectively address the HIV pandemic in the State.” “[r]eview the Same-Sex Marriage Prohibition Act in order to prohibit violence and discrimination in access to HIV prevention, treatment and care services, as well as to ensure the protection of other human rights of sexual minorities guaranteed under the African Charter and other international instruments to which Nigeria is a party.”