AP The mother-of-four was sentenced to seven years behind bars following the rape, and put on the registered sex offender list for the rest of her life. In the latest available statistics, in , just under school employees in the US were prosecuted for student sex crimes — around one-third of them female. Supplied Jessica Storer was sentenced to two years prison for having sex with a student. What could make them cross a line and prey on vulnerable youths? Journals with no new volumes being added to the archive. Last month, a former Texas high school teacher, Alexandria Vera , who was impregnated by a year-old but had an abortion, got a 10 year sentence and was thrown behind bars after pleading guilty to having sex on multiple occassions with the teenager. Information about subscriptions, article submissions, and advertising rates: What drives them to it? Journals that are no longer published or that have been combined with another title. And this not only minimises the offending behaviour, but it also unfairly downplays the consequences for victims. Emphasis is on exceptional quality and general interest. Alarmingly, that figure was mostly made up of school staff — including teachers, aids and head of schools. But following her release, the pair continued their relationship — and to date, have been married, divorced and share two children together. Moving walls are generally represented in years. Supplied Stephanie Peterson has been accused of allegedly having sex with a year-old male student. Journals that are combined with another title. The "moving wall" represents the time period between the last issue available in JSTOR and the most recently published issue of a journal.