Media playback is unsupported on your device Media caption "Rahul", who came out as gay to his wife, tells his story

The case of bisexual British businessman Shrien Dewani - cleared this week of murdering his new bride - shone a spotlight on the gay Asian community in Britain. How difficult is it to be gay when homosexuality is seen as a taboo?

It's a world that's often hidden.

Many homosexual men - and women - of south Asian descent are believed to be hiding their true sexuality within heterosexual, often arranged, marriages in Britain.

Rahul, a Hindu, knows what that's like.

He says he always felt he was gay, but accepted an arranged marriage anyway. He thought the "phase" would pass.

"But I realised very quickly that I'd made a huge mistake, that these feelings weren't going to disappear."

Family shame

When he finally came out to his family, they were angry.

"I felt that secretly a part of them always knew, I think parents always do know," he says.

"I think the anger was 'Oh my god, we all knew he was gay, but he finally told his wife. How could he do that?'."

Rahul - not his real name - says his parents would have been happier if he'd stayed married, had children and kept quiet about his homosexuality, which his community sees as "shameful".

He wanted to hide his true identity to protect his family and ex-wife from more shame.

Image caption Asif Quraishi performs as drag queen Asifa Lahore

South Asian communities prize marriage highly; from the day their children are born, parents begin saving for their weddings.

Many gay people come under intense pressure to marry someone of the opposite sex.

According to Asif Quraishi, who works for the support charity Naz, many of them succumb.

His contacts with people lead him to believe as many as seven in 10 gay Asians are in what he calls "inauthentic marriages".

'Derogatory words'

"There isn't actually a word for gay or lesbian in our mother languages," he says.

"The only words that there are are totally derogatory."

Asif is one of the UK's few gay, Asian drag queens. He's also a practising Muslim.

As Asifa Lahore, he runs a club night in west London.

Media playback is unsupported on your device Media caption Asif Quraishi explains why he called off an engagement

Many of the men and women there are leading double lives, conforming to what their families require of them, while also being gay.

Several talk about how much pressure they are under from their families to have a heterosexual marriage.

One man in the club says that when he came out to his family, his brother took him to a strip bar to try to "cure" him.

He says if his family knew he was at a gay nightclub, they'd kill him for "honour".

Honour is still highly prized in Britain's south Asian communities.

Terrible consequences

Many families tell their gay sons and daughters they should keep quiet about their sexuality for the honour of the family.

This can have terrible consequences.

Last week an inquest heard that London doctor Nazim Mahmood, 34, had killed himself after coming out as gay to his family, who told him to seek a "cure".

In April, Jasvir Ginday was given a life sentence for murdering his wife, apparently to stop her revealing his homosexuality.

They had an arranged marriage but the bank worker from Walsall was active on the gay scene.

Then there is the case of Shrien Dewani.

Image copyright Facebook Image caption Shrien Dewani was cleared four years after Anni Dewani's murder

The Bristol businessman had been accused of murdering his wife Anni on their honeymoon in 2010, but a South African court threw out the case on Monday.

The court case revealed that Mr Dewani was bisexual and had been seeing a German male prostitute before his marriage.

Asif Quraishi says the coverage has had a negative impact on the gay community.

He wants something positive to come out of it.

"It highlighted that gay Asians are entering inauthentic marriages," he says.

Not consummated

"Gay Asians need to take responsibility, to use the exposure to question these marriages.

"And, at the same time, the British Asian community needs to recognise that by pressuring their children into these marriages, it leads to mental health problems - and the real victims are the heterosexual partners."

Salma - not her real name - was certainly a victim.

She was forced into marriage to a cousin at 19. He told her on their wedding night he was gay.

"When we were left alone and it was time to go to bed, he said 'Is it alright if I sleep next door because I'm not into women?'," she recalls.

Their marriage was never consummated, but when she left him, she says she was blamed.

Even her own family tried to persuade her to go back, telling her she was a "bad wife".

Image copyright West Midlands Police Image caption Jasvir Ginday murdered his wife just six months after their wedding

Her mother told her if she "had done everything right, he wouldn't have been gay".

Salma adds: "She said 'You should have touched him, made him have feelings for you'."

The attitude of the south Asian community to homosexuality has even been absorbed by some of the gay and lesbian members within it.

Hrpreet - not his real name - is a married man in his 20s with a young son.

'Life in tatters'

He says that if his child told him he was gay, he'd be upset because being gay is wrong.

And yet Hrpreet calls himself bisexual, and says he prefers having sex with men.

His wife and family don't know that he regularly goes to gay clubs and picks up men.

If they found out, his life would be in tatters, he says.

In a country where gay rights are enshrined in law, for many British Asians so much is still shrouded in secrecy.

And it will remain so until their community accepts them for who they are and understands that marrying someone of the opposite sex is not a "cure" for being gay.

You can watch Katie's film in full via the BBC iPlayer.