Four teens have been arrested after two women were bashed and robbed on a London bus when they refused demands to kiss.

Melania Geymonat, 28, and her girlfriend Chris were on a date on May 30 (local time) when they boarded a night bus in West Hampstead.

Ms Geymonat posted on Facebook that at least four guys demanded the couple kiss so they could “enjoy watching”, called them lesbians and described sexual positions.

“In an attempt to calm things down, I started making jokes. I thought this might make them go away,” Ms Geymonat posted on June 6.

“Chris even pretended she was sick, but they kept on harassing us, throwing us coins and becoming more enthusiastic about it.

“The next thing I know is I’m being punched. I got dizzy at the sight of my blood and fell back. I don’t remember whether or not I lost consciousness.”

London’s Metropolitan police said four males aged between 15 and 18 had been arrested on suspicion of robbery and committing a hate crime.

“As they sat on the top deck, they were approached by a group of four males who began to make lewd and homophobic comments to them,” the police statement said.

“The women were then attacked and punched several times before the males ran off the bus. A phone and bag were stolen during the assault.”

Both women were treated in hospital for facial injuries, police added.

London mayor Sadiq Khan said on Twitter: “This was a disgusting, misogynistic attack. Hate crimes against the LGBT+ community will not be tolerated in London”.

‘Rare’ attack for London

Detective Superintendent Andy Cox said attacks on London buses were rare.

“This was a disgusting attack on two women who appear to have been picked out and targeted by a group of youths,” he said.

“The suspects have made a number of homophobic comments towards the couple before throwing coins at them.

“When the women tried to reason with the group, the attack escalated to an assault.

“CCTV footage from the attack is being reviewed by detectives.

“Lots of people will understandably be outraged by this attack. Our efforts to trace all the suspects involved and bring them in for questioning will be relentless.

Ms Geymonat said she hoped the attack would raise awareness of violence against the LGBT+ community, especially during June which is Pride month.

“Violence has become a common thing, that sometimes it’s necessary to see a woman bleeding after having been punched to feel some kind of impact,” she said.

“I’m tired of being taken as a sexual object, of finding out that these situations are usual, of gay friends who were beaten up just because.

“We have to endure verbal harassment and chauvinist, misogynistic and homophobic violence because when you stand up for yourself shit like this happens.

“I just hope that in June, Pride Month, stuff like this can be spoken out loudly so they stop happening.”

-ABC