Because the majority of the audience are males..

Do the people saying "get rid of booth babes" have no consideration for the ladies losing a paying job because people who complain want to feel morally superior? Why not ask the women if they want the concept scrapped? Perhaps because the perpetually offended types might not like the answer, IMO.
When they advertised Diet Coke to women, there was a whole ad campaign full of hunky men to catch their attention. Sex sells - and by that, I mean it catches the attention, which is what advertisers want. It's not really that difficult a concept, and it works on both sexes.

Sex sells.

Always had, always will.