Security has been stepped up at the city's main library after it was named as a hotspot for gay sex.

The Jubilee Library is listed on a gay cruising website and a page dedicated to it viewed more than 4,000 times.

A page lists the best times to cruise in the toilet cubicles, provides tips on how not to be detected and even describes regular visitors as "booky types of all ages".

The situation was only revealed when a shocked parent contacted The Argus after spotting the website address scrawled on the wall of a toilet cubicle in the library.

Brighton and Hove City Council, which runs the £14.5 million library, has pledged to step up security in light of the revelations The parent, who did not want to be named, said: "People are having sex in the library cubicles while children are using the ones next door. This is disgusting.

"This website and others were scrawled across the cubicle walls.

"I am not homophobic but people's intimate activities should be in private and not in the cubicle next to my child going to the toilet."

The website page is on the squirt.org site which has more than 500,000 members and is described as "a community built by guys who cruise for sex with other guys".

The page was posted by a member called "TrixieGolightly" and has been viewed thousands of times.

There are also 39 messages left on the site from members arranging to meet in the toilets.

One reads: "Hi guys, going here today, will be near the downstairs toilets hanging around, grey hoody on, 2.30pm until 3pm if anyone wanna meet?"

The impressive glass-fronted library in Jubilee Street was funded through a PFI project.

It has proved popular since it opened in 2005, with just under 900,000 visits and 695,000 issues every year - making it the second busiest unitary authority library in the country.

A spokesman for the library said: "We have checked today and there is no graffiti in the toilet as they are checked and cleaned every day.

"We have an excellent security service that regularly patrol to prevent misuse of the toilets."

A spokesman for the council said: "The council policy is to clean graffiti on public buildings, especially when it can cause offence.

"This would apply to these toilets. We will keep a check on graffiti on these toilets and security will keep an eye out for any inappropriate behaviour."

A Sussex Police spokeswoman said: "We haven't had any complaints, but if offensive behaviour is brought to our attention we will look into it."