A very good friend of mine (albeit male) is an FA for EK and enjoys his job. I have asked him before about staff treatment, work conditions and how women in particular are perceived. They (FA's) are under no illusions that work conditions are the same as a western country, and in comparison are very conservative from a moral, sexual and authority perspective. They are also told right from the beginning that there are some rules that cannot/should not be broken otherwise their visa will be revoked and they will be deported. These rules don't involve body shape or outside of work hour antics, but do generally relate to abuse of privileges and unbecoming behaviour while on the job.
Women FA's are generally treated well and looked after the same as any other staff members. Both male and female do have to adhere to the 'Emirates look' which is not a set criteria but is implied that their body shape needs to be slender in size. My mate has heard reports of people being told they are not adhering to 'the look' but he is unaware of anyone actually having their visa revoked. That's not to say it doesn't happen, but it appears to be kept quiet or doesn't happen often.
There are plenty of stories of FA's losing their jobs due to messy behaviour while overseas, but to be frank I think a lot of airlines (or other companies for that matter), ME based or not would react similarly.
As for QR, amongst the ME based FA's they are known for being ultra conservative and in general not a fun place to be....