WOTT jane10 - truly. Nobody is asking you to do any of those things.
As anno and others have said, if wearing a burkini allows those women to go swimming, great. As for the Hygiene issue as compared to long short for men- the issue there is that they are often worn to cycle to and from the pool, or all day- and then at the pool. Burkinis are made of a very fine material, and are worn only for swimming and washed in between- no comparison.
When I was in Sharm with GReatnan a few years back, several young women wore colourful burkinis at the pool and it was great chatting to them and their families. What was truly disgusting was the other guests, mainly Brits and some Germans, who would cover themselves with loads of suntan oil, sweat for a couple of hours, jump in the pool (without using the showers which were at each end of the pool and the many signs present saysing showing was compusory) and then start all over again- several times a day! Now THAT is disgusting and unhygienic. The lovely pool attendant, a young doctor from Cairo- just couldn't understand why Brits refuse to shower- despite being reminded several times (and insulting the pool attendant for reminding them- yes a young man with 100x+ their brainpower).
As for pressures form the males to cover up- is it very different from the pressures to be thin and look great in a tiny bikini... for them?