It's a female sexual phenomenon which has baffled experts for hundreds, if not thousands of years. 

Yet scientists may have finally answered one of the biggest questions surrounding 'squirting'.

The liquid that spurts out during an orgasm originates in the bladder, meaning it is mostly urine.

Yet, the fluid expelled is not completely urine — it can contain female ejaculate, an experiment found. 

The bizarre study, performed in Japan, saw five women climax in a laboratory, either through sex with their partner or masturbation.

All of the volunteers, who were in their 30s, 40s or 50s, mucikari online were able to squirt.  

They had a water-based solution coloured blue injected into their bladder, allowing researchers to track the liquid during their orgasm.

Just before the squirting 'commenced', the Miyabi Urogyne Clinic team entered the room to catch the emissions in a cup.

They admitted it was 'difficult'.

'All squirted fluids were blue', Dr Miyabi Inoue and colleagues said. 

Dr Jessica Påfs, a sexologist based at the University of Gothenburg in Sweden, said: 'This confirms that squirting does seem to originate from the bladder.'

But she told

She added: 'Does the liquid have the same composition as urine? And why is it that some women expel this liquid and others don't?'

Four women involved in the study also experienced 'female ejaculation', a sensation different to the process of squirting itself.

Squirting refers to the involuntary expulsion of a fluid 'as clear as water', and enough to make some women feel like they've wet themselves.