There is very little football at lunch time, as there is very little space for it. There is a rota but only one form at a time has a turn on the muga - and it is supervised, so yes, I suppose that counts as supervised sport with contact - the other forms in other places have no contact during break and lunch time.
It isn't really an issue - if I see physical contact I give a warning, and if I see it again I give a negative house point - no one ever disputes it, or argues
I've worked in schools without this rule, and a huge amount of time is wasted unravelling playfights, ( and playfights are the main issue, not boys touching girls, although this can be an issue too)
In one school I worked in, this rule was introduced after complaints that the culture of kissing and hugging between girls was non consensual, and being used to intimidate - it was, but not by all girls. The girls who enjoyed the kissing and hugging were upset at the new rule and it was hard work to impose at first, but within a few months it had become the norm ,and of course for new students entering in year 7, they didn't know any different.
That is the only time I have ever known such a rule be an issue - and even then I think it was more about the way it was imposed, rather than the rule itself