I think as perceptions of relationships change - affairs being considered a much greater scandal rather than an occasional fact of married life, and polyamory,

I think as perceptions of relationships change - affairs being considered a much greater scandal rather than an occasional fact of married life, and polyamory, open relationships and other assorted variant approaches coming more out into the open - people with a high libido as well as a high functioning brain are more and more taking a structured approach to the problem and one that doesn't require them to bother keeping track of more than one version of reality. I certainly count myself in that category - I'm happily open/poly and so are a noticeable number of the open source geeks I interact with on a day to day basis. And from the ranks of my local friends, the other two who've followed this approach for some time are a chemist and a physicist. I kind of pity anybody stuck in a situation where they end up cheating because they're unable to have the conversation with their partner that would allow them to either change approach or to understand that their choices are circumscribed if they want to retain the relationship - or worse still simply unaware that alternative approaches can and do successfuly exist. Though I do still keep a small notebook and a pen on me for when what meager inspiration my brain is capable of strikes me when I'm out having fun ...