The ad featured a woman pulling a black top over her head to reveal black underwear and the headline, "I'm definitely not going to sleep with him".
The ASA received a complaint describing it as irresponsible because of the number of rape cases in which the man's defence is that the woman did not mean it when she said no. Others complained that the poster was offensive and unsuitable because children would see it.
Conde Nast said it had not intended to offend or suggest that when a woman says "no" to sexual advances she does not mean it. It argued the ad was humorous and showed a woman dressing for a date with her boyfriend and, although trying to convince herself she was not going to sleep with him, she was dressing as though she was.
The ASA said the ad's message was ambiguous but "unlikely to be interpreted in the way the complainant believed or cause serious or widespread offence".
www.asa.org.uk