Here's a way to look at it.
Sex is a consensual act between adults.
Lying to get that consent means that consent was obtained illegitimately and may not have been given otherwise.
Obtaining something illegitimately is theft.
Theft is taking something without consent.
Sex without consent is rape.
So logically...
OK, I'm being an asshole, there are all kinds of lies, but you can see the dodgey ground this could be?
If you don't care enough about the person to tell them the truth, then why do you want to have sex with them? Just for self gratification?
Sex is a consensual act between adults.
Lying to get that consent means that consent was obtained illegitimately and may not have been given otherwise.
Obtaining something illegitimately is theft.
Theft is taking something without consent.
Sex without consent is rape.
So logically...
OK, I'm being an asshole, there are all kinds of lies, but you can see the dodgey ground this could be?
If you don't care enough about the person to tell them the truth, then why do you want to have sex with them? Just for self gratification?