Perhaps it's because I can't relate to the environment. No one in my grade school (I never went to nursery school or kindergarten) had "two dads" or "two mums". In my little school, where I was in the largest class ever with six students, there weren't even any single parents. I didn't even get a hint of what homosexuality was about until L.J. tried to explain in to me in about the fifth grade. But in any case this seems just a little off base:

Nursery teachers should promote tolerance of same-sex partnerships and outlaw the use of offensive homophobic language in the classroom or playground, a teaching union said today.

...

The NUT said: "It is particularly important to begin to make three to five-year-olds aware of the range of families that exist in the UK today". That would includes families with single parents or those with "two mums" or "two dads", the union said.

...

The guidance, which has so far been voluntary, is due to become compulsory for early years staff from next year, following the outcome of the consultation.

Is this really an issue in the lives of three to five-year-olds? It would be difficult for me to defend this against the obvious accusations and baggage of "promoting the homosexual agenda" or some such thing.