A huge inflatable pink cake with candles spouting rainbow flames has glided through the Amsterdam canals as the Dutch capital celebrated the 20th anniversary of the world’s first legal same-sex marriages.

But even as the city marked the milestone in LGBTQ emancipation, its mayor said that striving for equality remains a work in progress.

“At the same time it is a moment to recognise that the struggle is not yet over; not worldwide, not nationally, but also not in Amsterdam,” mayor Femke Halsema told the Associated Press.

Since the historic event in Amsterdam 20 years ago, same-sex marriage has been made legal in 28 countries worldwide, as well as the self-governing island of Taiwan.

Gert Kasteel and Dolf Pasker were celebrating 20 years of married life on Thursday.

It is an anniversary made all the more special as they were among the first four couples who tied the knot just after midnight on April 1 2001.

Wearing suits and bow ties, they were married in a ceremony led by then-mayor of Amsterdam Job Cohen in a wedding that made headlines around the world.

“It is very nice to look back to see how young we were,” said Mr Pasker after watching video of the wedding on the evening before the anniversary.

Amsterdam also marked the anniversary by flying a huge rainbow flag from the bell tower of the landmark Wester Church next to the Anne Frank House museum.

Later, the city was holding an online symposium, and it designated a “rainbow walk” route along 20 sites considered important in the struggle for LGBTQ rights.

Sitting with his husband at a table in their back garden in a small town close to Amsterdam on a warm spring evening on Wednesday, Mr Pasker said he is pleased that the trail they blazed has been followed by many other nations.

“Nearly 30 countries followed the Netherlands so that’s really very nice. Very good for the gay people and for society as a whole, I think, because it’s important that everyone in society feels at home,” he said.

Henk Krol, a former editor of the Netherlands’ largest gay newspaper, this week called same-sex marriage the country’s “most beautiful intangible export”.

But COC, the country’s largest LGBTQ rights organisation, also said that work towards full equality is not complete in the Netherlands even two decades after the first same-sex marriage.

LGBTQ people “still regularly face exclusion, violence and discrimination”, the organisation said in a statement.

Mr Pasker agrees, though he said it has not affected his marriage.

“In our private life it could not be better,” he said.

“But we know from newspaper, television and people we speak (to) that there still are homophobic people and there is some aggression to gay people. That’s still a problem.”

But as he counted down to his anniversary, he hoped others could live in the same wedded bliss.

“We wish all gay people in the world that they can have a life as we can live. It’s very important,” Mr Pasker said.