Probably if the women had made a big fuss, reported the behaviour to the police, etc, etc, the agency would be unlikely to give them further employment. Anyone who works for an agency - whatever the field of employment - learns very quickly that it is unwise to complain about anything.
This sort of portrayal of women does not just affect the women involved - it affects every woman - the way that women are viewed and treated by men, and by other women.
Statistics show that women are significantly under-represented in more senior work roles and in many instances, even if they achieve such roles, they have not received equal pay and equal treatment. I believe girls must, if only subliminally, notice this under-representation. They must also notice that another way for females to achieve success is to writhe around in pop videos with very little on (which many people on here have complained about) or to use what physical assets they have and take on overtly sexual roles in order to market newspapers, events, products, etc.
Of course, marketing companies are quite happy to use these sorts of methods because it helps them make a lot of money. But I think it is unwise to collude in this sort of objectification and marketisation of women. The end result, as was demonstrated in this particular event and as other gransnetters have reported, is that male/female relationships become even more unequal and lacking in mutual respect and kindness.
Do those who disagree with stopping young women being used as "eye candy" in F1, boxing and darts events, etc. also believe that it would be a good thing if we still had the Benny Hill Show, Miss World and page 3 photographs? Have a look on the internet at advertising posters from the 50's and 60's and I'm sure most of you will be shocked at the sexism and racism displayed. It is only because people started to question the ideas behind them that things changed.