A little-known party has sought permission to show US President Barack Obama the differences between a man and a woman through a nude protest.

The peaceful demonstration against homosexuality will begin at 10 am at the Freedom Corner, on July 22 and 23, said Republican Liberty party leader Vincent Kidala.

"The procession shall be carried out by approximately 5,000 totally naked men and women to protest over Obama's open and aggressive support for homosexuality," Kidala said in a letter to the county commander on Monday.

"In fact our party has a network of prostitutes in Nairobi, Nakuru and other counties. This is where we shall get all these people whose number we expect to increase," he told the Star on phone.

He said the prostitutes agreed to participate free of charge since they will lose customers if homosexuality is legalised.