The job of a model is to make whatever is being modeled attractive to those that might be a consumer. If you feel that making items appear attractive is sexist, why the hell would you get into the modelling industry. Let's look at the very first quote from one of the models for some insight into exactly why:
"But the work is pretty relaxed and you don't have to do a lot in order to get paid."
Complaining about being stared at for these women is like a call center employee complaining about having to speak to so many damn callers. Any physical contact or lewd suggestions from the consumers is completely inappropriate and should be prosecuted if it falls in the realm of illegal. And doubly so for their employers. But for a model to complain about getting stared at it is ridiculous.