The issue of bums in public places (Ok if female, male, not so much)

THIS segment aired on The Paul Henry Show last night (23.4.14). It's about a play, Ladies Night that wanted to use a nude male butt for it's advertisment on the back of a bus. The advert was turned down on the basis that it was likely to cause widespread offence...(seriously)....so next they submitted a male torso... easy you would think? Topless guys frequent adverts. This was again turned down as it showed the upper groin. The upper groin? what the hell is the upper groin? Well according to the agency it's the area between the top of your hip bones/belly button down to the top of the pubic bone. (Who the hell uses the term upper groin?) All in all a very small amount of skin. The accepted image was half a torso (including a nipple!)

Fast forward the segment to a current ad on the back of a bus, by the same advertising company. A Shot of a Woman's legs, including butt, straddling a canoodling couple. In this shot, all three people have their 'upper groin' areas on show.

SO it's ok for a sexualised woman's butt to frequent an advert, but heaven forbid we catch a glimpse of a nude male one?
Words that come to mind here are sexist, hypocritical and double standards.
The advertising company in question did not want to comment.

One day I would like to live in a world where sex and objectification doesn't sell. But until then I will be happy with equality in the business of using sex to sell.

Images in question
(screenshots taken from video)

The image deemed to cause widespread offence

Acceptable image