My sex education was by a fat lesbian teacher - forgotten her name - quite a character. I remember her showing how to put a condom onto a plastic cock. All a bit surreal. Frankly, a lot of us (particularly the girls) were already at our fumblings.
I think previously when quite young it had been discussed in Biology but nothing too helpful.

These days I presume it's about LGBTQ+ 57 others. Probably need a degree and masters in it. No doubt a new curriculum every week when someone invents the latest trendy gender (which are just sexual preferences).

We didn't do biology at my school so there was no obvious lesson in which to disseminate sex education.

However, one morning, after assembly, boys above a certain age ( it was a boys school) were asked to stay behind. At this point the school reel to reel projection camera was wheeled out and a fumbling member of staff explained that we were about to watch a film on the topic of VD! This must have been around 1968/69.

I can't remember if at that time I even knew what VD was . Of course, by the end of the film, I did, in all its "glory". It now strikes me as strange that the first and only educational reference by the school to the sex act was telling us what horrible diseases could be transmitted by such activity.