A woman has been charged after allegedly sexually abusing two teenage boys in the NSW Riverina region.

NSW Police in November last year began investigating reports a 15-year-old boy had been sexually assaulted by a woman who was known him.

During the investigation, detectives discovered information about other boys who had sexual interactions with the woman, police said in a statement on Friday.

A 34-year-old woman was arrested at Wagga Wagga on Thursday.

She was charged with 11 offences including intentionally sexually touching a child between 10 and 16 years, sexual intercourse with a child between 14 and 16 years and using a carriage service to send indecent material.

Police allege the woman groomed and sexually abused two boys – both aged 15 – and incited a third boy, 14, to allegedly perform a sexual act in the Riverina region between May and November 2019.

Another boy, 13, was sent indecent images and messages, police said.

The woman was refused bail to appear at Wagga Wagga Local Court later on Friday.