A woman was playing a kissing game in a hot tub at an alcohol-fuelled party when she sexually assaulted three women, a court has been told.

Jennifer Peterson, 31, pleaded guilty in the County Court of Victoria on Monday to assaulting three women at the wild party on December 4, 2016, following a day spent drinking at a Christmas function.

Jennifer Peterson leaves court on Monday. Credit:AAP

Her lawyer, Julian McMahon SC, described the party at a home in an inner Melbourne suburb, as a "highly sexualised environment saturated with alcohol".

"It's clear there was a lot of nudity and it was a very tactile event, lots of bodies squashing into spas, lots of people engaging in a range of conduct from dancing naked to games such as 'truth, dare or pash,' and lots of people kissing each other," he told the pre-sentencing hearing.