A Nigerian man was punished with 20 lashes after being found to be gay.
In the northern city of Bauchi, 10 Muslim men were arrested for belonging to a gay rights organization.
They will be tried under Islamic law, where homosexual acts are sentenced to death by stoning.
One Christian, also arrested, will be tried under secular law. He could face jail for up to 14 years.
The Nigerian, who was among the men arrested, was also ordered to pay a fine of about $30 (€22).
With the trial of two other men adjourned to 23 January, the fates of the rest of the men are unknown.
Police have confirmed to Amnesty International they have a list of suspected LGBTI people in Bauchi as part of their ‘profiling of criminals’.
An assistant commissioner of police said: ‘The police have a list of suspected gay people under surveillance.
‘We use the list to conduct our surveillance [...] We also use it to find out who their victims are.’
It is being alleged police are using torture to obtain other names of gay men in Nigeria.
It emerged earlier this week President Goodluck Jonathan signed the ‘Jail All The Gays’ bill.
Under secular law, the legislation bans same-sex marriage, criminalizes gay clubs and associations, and sets up prison terms of up to 14 years.
Openly gay people risk being imprisoned whether or not they have sex.
Anybody who knows somebody who is gay will have to tell the authorities or go to jail for five years.