A massage therapist was allegedly sexually assaulted several times by a client of an African appearance called 'Jay' during a session in her Melbourne home.

A massage therapist was allegedly sexually assaulted several times by a client during a session in her Melbourne home.

Police are hunting an African-looking man known as 'Jay' who drove or who was driven to the woman's house in Ivanhoe on April 8 about 12pm.

Half the session went as normal but halfway through he allegedly turned on her, assaulting her multiple times before fleeing between 12.50 and 1pm.

The man was described as in his mid 30s, 179cm tall with an athletic build, shaved head, and had two small scars at the base of his back.

He was wearing a red jumper, black pants, white skate shoes, and sunglasses when he arrived at the house for his massage.

Sex crimes squad officers investigated for the past few months and released a composite sketch of the man in the hope someone would recognise him.