Never been able to figure out why,but every few months or so I get so horny that all I can think about is sex. The longer the cycle lasts - the hornier (and dirtier!) I get. I start fantasizing about being taken roughly,tied up and forced to orgasm, and being spanked of course - that's my favourite.  Spanked, toyed with and fucked by a wicked teacher or boss (or policeman, doctor, prison warden, soldier - anyone in authority will do!) I like to be the innocent victim, tricked into being fucked, being told that I haven't got any choice in the matter.  It's quite frustrating but really gets my creative juices flowing...among others!