Lusaka - Zambian police have arrested a gay couple after the family of one of the men reported the relationship to authorities.
Human rights activists have berated the police, saying they should stop arresting people practising same-sex marriages.
It was the first arrest of its kind under tough anti-gay laws.
James Mwape (20) and Philip Mubiana (21) from the northern town of Kapiri Mposhi, are said to have been living together for some time.
"The two have been charged with the offence of sodomy or having sex against the order of nature contrary to the laws of Zambia," said central province police chief Standwell Lungu.
The two men will appear in court on Wednesday.
Police allege that Mubiana played a female role in the relationship and had at times attempted to dress like a woman, prompting his relatives to report the two to the police which led to the arrest on Monday.
"The relatives are the ones that reported the matter to the police," said Lungu.
Human rights activist Josab Changa said the authorities should stop arresting people practising same-sex marriages.
"Arresting them is an infringement on their human rights. Human rights should be respected irrespective of the perceived evil that somebody may do," said Changa.
Last month another rights activist, Paul Kasonkomona, was arrested for appearing on live television calling for the decriminalisation of homosexuality in this deeply conservative southern African state.
Homosexuality is also forbidden in many other African countries.