It is often said that most homophobes are themselves closet cases, so it should come as no surprise that leaked secret service documents in Poland have suggested that Prime Minister Jaroslaw Kaczynski may be gay.

Mr Kaczynski, who is known for his opposition to gay rights since attacking same sex marriage earlier this year, was investigated in 1992 as officials aimed to establish his sexual orientation, the documents reveal.

The papers, exposed by Polish newspaper Rzeczpolita, document a discussion on the leader’s sexuality, in the files, Colonel Jan Lesiak is reported to have said: “It is advisable to establish if Jaroslaw Kaczynski remains in a long-term homosexual relationship and, if so, who his partner is.”

The revelation is likely to cause embarrassment for the politician who attacked gay marriages within minutes of becoming Prime Minister last July, saying, “We won’t let ourselves say that black is white, we are going to protect this (marriage) foundation of social life.”

His twin brother also has some colourful views on homosexuality. When serving as mayor of Warsaw, Lech Kaczyznski attempted to ban Gay Pride marches in 2004 and 2005.

Gay bars and organisations have also faced closure under the siblings.

The statements of both Kaczynskis have put Poland on a collision course with the Western states of the EU, most of whom are granting even greater rights to LGBT people.

As well as enraging EU colleagues with their anti-gay stance, the ruling brothers have indicated they believe in a reintroduction of the death penalty.

Prime Minister Kaczynski is a confirmed bachelor who lives with his mother.

The twins first came to prominence in Poland as child actors in the 1962 film Two Who Stole The Moon.