The mother of two preyed on the boys, aged 15 to 17, performing sex acts at locations including a school premises, public woodland and her home in Berkshire while her husband and children were out.
She performed sex acts on four boys, with a fifth groomed via "sexual texting", which included sending him photographs of her performing sex acts and using sex toys.
Reading crown court heard that one of Webb's friends had even asked her to stop contacting the boys via Facebook. But it continued.
Judge John Reddihough, sentencing Webb for 30 sex offences to which she had pleaded guilty, said she had risked leaving the boys with a "distorted attitude to females and sex".