The girls belonging to this group (coven?) learned only one thing in college: if you REALLY want something (REALLY!), the only way to get it is through black magic. That is, unless you want mono, in which case you can simply stand near other students and/or drink from the public water fountain.
Coming together from different (but local) universities under the head of the biology department and his obsessive TA, the witches find out the hard way that participating in naked sex rituals can attract the wrong sort of attention...