Doodledog men can face discrimination in the same way because being older with more experience makes them more expensive.
I remember my dad complaining about this is the 70's. The company he worked for were employing new staff for a team he was heading for a new project. Only one older man was taken on along with younger, well qualified young men but with no experience.
My dad was under increased pressure as he was having to train them on the job.
In an ideal world, there shouldn't be anything wrong in asking for flexible working hours providing of course that those making the request realise it may not be possible. Realistically if this request is predominantly made by women, as you say, this "can work against women (assuming that they are the more likely to ask for them) in the same way as maternity leave".
Gary Glitter programme Tuesday
Army horses loose on London streets