In a legal first in the U.K. ‘The prosecutor convinced the jury that sex obtained through deception is not true consent.’: https://reason.com/2019/09/25/u-k-trial-court-lying-about-vasectomy-negates-consent-to-sex/ … @HWistrich @bindelj are we getting there 
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Unfortunately it depends on the nature of the deceit - vulnerable woman deceiving = crime; well resources undercover police officer deceiving as to purpose of relationship = legal!
