There is nothing wrong with using females wearing provocative attire such as bikinis or bras/panties to sell beer.
The beer consumer skews more male than female. When women drink, they tend to drink more wine and spirits.
The audience for beer brands has typically been more male and men want to have sex with women.
It makes sense to connect beer with sex through the use of women in provocative attire for a male audience.
Any beer brand can choose a different approach than women in skimpy clothing. It's ridiculous for a brand that was partially built on ads emphasizing sex and scantily clad women to make an ad now to say that was wrong. Making an ad to say it was wrong to connect beer with sex is insulting to the male customer base.
When the product is at the level of refinement of low-quality commodity, then aside from just being the cheapest (which profit-wise is unstable), there needs to be some type of meme associated with the product that motivates consumers to buy it. Patriotism, either on a national level or local level (i.e., support the local brand), is one way; being associated with a memorably funny meme (e.g., "less filling, tastes great") is another; and of course, good old T & A is always one that can be counted on, whether it's effect is unconscious or conscious (i.e., I'm going to buy this beer because it shows good T & A).
Contrast this with micro-brew, which because it is good beer and will have a consumer base precisely because it is good, doesn't need all that stupid stuff - all it needs is to be good and put all the money into making the beer consistently good. My global favorite, Hoegaarden, has a product meme that is the exact opposite of T & A - i.e., Belgian monks!