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1.
When a person (usually a woman) uses guilt, power, or knowledge of certain secrecy, to force another person into having sex or performing sexual favors.

Knowing of his previous acts of adultery, his portly cousin saw it as an opportunity to use sextortion to gain some sexual pleasures of her own.



by KSense January 26, 2009
 
2.
Extortion in sexual trysts. Blackmail using Sex, Sexpionage in action.
The FBI and CIA commonly use Sextortions on state and political officials now.

Clinton was being Sextorted via the Monica Lewinski affair.

NY Gov. Elliott Spitzer, the "Sheriff of Wallstreet", was Sextorted to remove him from investigating the bank foreclosure scheme.

Google: FBI Corruption Robin Head
by xxxMadam July 28, 2009
 
3.
A portmanteau of "sex" and "extortion;" when one has knowledge of someone's infidelity and threatens to make said knowledge public unless they are given a large amount of money
David Letterman became a target of sextortion when a former CBS producer threatened to disclose Letterman's history of affairs unless Letterman paid him $2 million.
by leo3375 October 03, 2009