A former massage therapist in South Australia has pleaded guilty to nearly 100 sexual abuse offenses involving 40 women while working at 4ever Massage Clinic in Glenelg, Adelaide.

The 38-year-old massage therapist, identified as Sumit Satish Rastogi, appeared in the District Court, where he admitted to 42 counts of aggravated indecent assault and three counts of indecent filming.