This occurs when women break up with their long term boyfriends. EVS becomes active in women about a week or less after a break up of a long term sexually active relationship. this can be beneficial to men looking to have intercourse with said woman/chick. this operates much like a "rebound". EVS also has many varyations, including: virgin evs (VEVS)~ when a girl wants to have sex really badly because she is a virgin. situational evs (SEVS)~ when a girl wants you cock because of the fact you are "playing hard to get". and cyclical evs (CEVS)~ when a girl has broken up and the original case of EVS has already run its course, this usually doesnt occur until about a year after not having sex and when the initial EVS is done.
empty vagina syndrome (E.V.S)- dude she just broke up with her bf...shes going to have evs in a few days.
VEVS- dude she is a virgin, she wants it so bad.
SEVS- dude i didn't talk to my gf for like a week, im giving her some SEVS.
CEVS- dude she had a bf like a year ago and hasnt had sex or a bf in so long, she wants it bad now.