Richard Allen Casey, 50, of West Philadelphia was sentenced to 57 to 114 years in prison on Thursday.
Casey admitted to attacking women at gunpoint in late 2006 and early 2007. Police say he licked and sucked the victims' toes, sexually assaulted them and physically attacked them.
Casey was already in state prison on unrelated charges when he was charged in the attacks in May 2008.
He was linked to the crimes by DNA.