Oscar De La Hoya is being sued by a woman who claims the boxing legend sexually assaulted and battered her during a booze-fueled 2017 hookup ... and the allegations are graphic.
The woman who filed the suit uses the alias "Jane Doe" to protect her identity -- but describes herself as a licensed vocational nurse who met Oscar in 2016.
In her suit, filed in L.A. County Superior Court, Doe admits the two had an ongoing consensual sexual relationship, but says things went awry in Nov. 2017 when he invited her over to check out his new house in Pasadena.