AIBU to think RSE lessons should be separated by sex not gender identity?

If girls don't get periods, what should they do?

Yes, that's right. Seek medical help. Because they should be getting periods and the doctors need to figure out what the problem is.

Of boys don't get periods, what should they do?

Yes that's right. Absolutely nothing. Because that is not what boys experience in puberty.

What? Seriously? As the parent of a boy and a girl, you seriously want my boy to know nothing about periods? Come on love - you can’t mean that!

It’s not insane to say that plenty of girls won’t get periods. they won’t get a ‘normal’ puberty for many reasons. It’s not insane to acknowledge there are people who fall outside of what is ‘the norm’ for their biological sex. and whilst biological males
won’t get periods then who exactly does it hurt for them to be aware of periods and how they work? 2 of my sisters have turner’s syndrome and never had periods, should they have been excluded from PSE on that basis?
The problem isn’t including this child, it’s splitting them up in the first place.

How old is a year 4 child? How will this little boy feel when he never gets a period? Doesn’t develop female secondary sex characteristics? How will that impact his mental health and development? Why would parents/school be so cruel as to make him believe these sex-segregated lessons are relevant to him because he’s allowed in them? This sounds like a case where his parents need to lovingly teach him the reality of the path they are putting him on, the puberty blockers, cross sex hormones, infertility, potential future medical procedures and their associated complications and the fact he can’t actually change sex. My heart goes out to him.

My son is in a very large south London primary with 3 form entry. He’s in year 5. Everyone is together to learn about these subjects. They don’t divide the children.
Me and my son had a very detailed chat about how crazy it is that women don’t know when their period will start (ie we know roughly but not to the minute).
don’t understand why they’re dividing genders at all

Surely its even more important that a child might have an "intersex" condition learns what to expect during puberty for the sex they think he is. Because if the expected puberty doesn't happen then they would need to take him to the doctors to see why.

I'm not sure how he wouldn't have been diagnosed at birth, but then was at some point between infant school (OP says he was a boy then) and juniors. How would you know there was something "wrong" when they are that young?

If there are children with complex DSDs that will be discussed with the teacher presumably and the right course of action determined.

There doesn't seem to be any reason to assume this boy has a DSD

I doubt the OP is suggesting boys shouldnt hear about female puberty.

Simply that there are details and questions that each sex will talk through that they will be more comfortable doing in a single sex class.

That doesn't mean there could also be classes that they all attend together

Nothing will "happen" but as this was supposedly a girls only lesson, the children were being taught what should (unless there's a medical issue) happen to them. Female puberty will not happen to this child, so unless the teacher said "This is what happens to girls, but not you Doris" then the poor kid is going to think it applies to him.

Boys absolutely need to learn about female puberty, bodies, etc. But it doesn't sound like that's what this lesson was.

Oh come on. Enough of this biology for the insane.

There are commonalities that all/most girls will experience and commonalities that all/most boys will experience. We all know that, even you.

Are you going to prepare boys for the onset of their periods?

The school has decided to make these classes single sex.

They have then completely undermined that by allowing a boy to be present.

Given the recent SC clarification that single sex provision means biological sex only, I expect they are on very shaky ground here and the OP is completely within her rights to complain, which I'm sure she will.

Why on earth would you advocate for a boy to attend classes designed to prepare him for female puberty (which he won't experience) but not male puberty (which he will)?

Its utterly neglectful. To this boy as well as all the girls.

Not all biological females will experience puberty in the same way, nor will all biological males. This child might have an intersex condition where they will experience female puberty for all we know.

we had this. The boy stayed with the boys for the lessons in year 4 about periods. The boys all go and play sport or something for an hour.

In year 5 they go over it together but they prefer to do girls first so they can ask questions etc and feel more comfortable. Of course a boy shouldn’t be in it. He’s not getting periods!

Agree.
OP what do you think will happen if a biological boy hears about female puberty?

I don’t know why, because as i said it’s not my business. Why do girls ‘need time and space to process without boys present’ in a lesson at school? They can go home and process it alone. Unless you make a big deal of it, it’s highly unlikely the girls will care that this child is there.
The OP doesn’t get to decide if this child is included in this way. Her only right so to remove her child from the classs if she wishes.

All females share biological traits that are distinct from biological traits all males share. Puberty is one of the periods where this is particularly manifest.

all females are not biologically the same, neither are all males. That’s simply demonstrably untrue.

Well of course it's to do with her. Her daughters single sex lessons now have a boy in them. Why don't girls deserve the time and space to process this information without boys present?

On another note, why is this boy learning about what happens to girls bodies during puberty but not what will happen to his own?

The irony of trans people expecting us to refer to them as their "acquired gender" and use their preferred pronouns and refusing to accept that we don't identify as cis and therefore misgender us all the time is outstanding.

It has nothing to do with you, this child’s parents will have decided this with the school.
separating kids to talk about puberty is stuoid anyway in my opinion, all children should be taught all puberty signs.

Schools should not be socially transitioning pupils and this needs to be raised with SLT and Governors. It goes against all current guidance. Having said this, both groups of children should receive the same lesson either together or separately. It's good for the boys to learn about periods and girls should understand about boys' puberty changes, wet dreams etc. Do you think the school is doing this OP?

He probably won’t be reading Mumsnet so it doesn’t matter.

She's not gunning for anyone.

He shouldn't be in that talk because he isn't actually a girl.