A schoolgirl's party which wrecked her parents' home "was a cross between a Hell's Angels knees-up and a Roman orgy", guests revealed today.

The bash, which ruined the £260,000 house, saw up to 100 people partying with some taking class A drugs and others enjoying marathon sex sessions.

One guest described how the semi detached family home in Alberta Road, Durrington, was kitted out with seedy red lights, sex toys and a ready supply of ecstasy, cocaine and marijuana.

Shocked parents Julia and Robert Anscomb arrived back after a night in London to discover their drugged puppy dog Bailey was comatose while there was graffiti all over the walls and possessions had been smashed or stolen.

Yesterday The Argus revealed how daughter Gemma Johnson, 15, who hosted the party, went into hiding after the bash spiralled out of control and thousands of pounds worth of damage was caused.

Today guests lifted the lid on the debauchery and told how revellers: had group sex sessions on the family washing machine, wore masks and lashed each other with whips in the marital bedroom, downed cocktails of drugs and alcohol whilst performing X-rated shows, and destroyed expensive furniture and pushed over the TV.

Sean O'Brien, 25, of Brooklands Park in Worthing, said he saw people having orgies whilst popping ecstasy pills, snorting cocaine and horse tranquilliser ketamine and smoking marijuana.

He arrived with a group of friends at 10pm and stayed until 7am the following day.

He said: "I saw one man having sex with three women, one after the other, on top of the washing machine in the kitchen.

"At about 2am I went into one of the bedrooms and saw two boys having sex. Everything was going on, it was crazy.

"There were red lights put up in the rooms so it was like a red light district, whips and masks on the walls and sex toys lying about.

"I vaguely remember people taking about the dog but I don't remember that much about it because I was off my face."

When asked if he took part in the orgies, he replied: 'We all got involved."

Mr O'Brien said the party died down at about 4am when a fight broke out after a man saw his ex-girlfriend having sex with another reveller.

Dan Johnstone, 30, of Miguel Street in Worthing, said he was at the party for about an hour but left when it got too raunchy.

He said: "There were naked bodies all over the place on top of each other and orgies taking place.

"People were tied up to ironing boards - it was mental.

"There were a lot of naked people of all ages having sex with each other.

"Everyone was rolling about getting hold of each other then moving onto the next person.

"It was like watching a porn movie but I had to leave because I have a girlfriend.

"I would like to have stayed but I thought, 'If this gets back to my girlfriend I will be in trouble'."

Mr Johnstone, who dropped a group of friends off at the party, said he saw people take drugs as they destroyed the property.

He said: "I have been to some parties in my time but this beats the lot, it was like a cross between a Hell's Angels knees-up and a Roman orgy.

"People were sniffing cocaine and ketamine and I don't know what else.

"Before the party it was a lovely house but it was utterly trashed.

"I don't think she will be having another party any time soon."

Mrs and Mrs Anscomb had visited London for the evening to see the musical Spamalot for Mr Anscomb's birthday.

They said they allowed Gemma to have a sleepover with three friends but received a phone call the following day from a family member saying their newly decorated house had been trashed.

Two laptop computers, an iPod and leather jacket together worth £2,000 were stolen, as well as the passport of a foreign student lodging with the family.

The couple have been helped by family members and professional cleaners to put the house back in order and have submitted hefty insurance claims.

Last night Mrs Anscomb declined to comment.