YOUNG music festival goers were urged to think about safe sex while partying, to reduce the number of sexually transmitted infections.

More than 500 were paid $10 each to pee in a specimen jar that will be tested for chlamydia.

The instances of chlamydia in Australia is rising, with young people under 29 making up 80 per cent of those infected.

Chlamydia often has no symptoms but can be diagnosed with a urine test and treated with a dose of antibiotics.

Project officer Jen Lewis said the program, which has operated at the music festival for three years, would not continue next year as funding had run out. This year more than 1000 condoms were handed out.