Brandenburg-Altmark wrote:Or when he's the wrong ethnicity and your parents don't approve...
Well, who knows.
Simple fact is that any form of lying, regardless of how common it is, creates a situation whereby technically you are not being given due consent. Where you have sex without consent, depending on the nature, constitutes rape or sexual assault.
Again, just because it's very common doesn't deny the fact that deception is being used to procure sex. Stealing a sweet from a confectionary store might not be armed robbery on a bank but it remains theft.