How wrong is it to deceive someone into sex by lying, say, about one's profession? The answer is seriously wrong when the liar's actual profession would be a deal breaker for the victim of the deception: this deception vitiates the victim's sexual consent, and it is seriously wrong to have sex with someone while lacking his or her consent.

It is widely held that some kinds of deception into sex (e.g., lying about what pets one likes) do not undermine the moral force of consent while other kinds of deception do (e.g., impersonating the consenter’s partner). Tom Dougherty argues against this: whenever someone is deceived into sex by the concealment of a “deal breaker” fact, the normative situation is the same as there being no consent at all. Here it is argued that this conclusion is unwarranted. Dougherty’s negative arguments (...) against alternative theories of the deceptive undermining of consent are flawed, and his two positive arguments are unjustified. (shrink)