Well that was a great selection (thinking of the UK ones) of Britain's flowering youth. And Lovely the see the dick size bell curve demonstrated across all races and countries, and so many beautiful regular sized penises.
I say selection because I've been twice and there was no way I'd be in these photos! But also because I recall lots of women on the ride as well as older, fatter, hairer, baldies like me.
At the end of each of my rides, I could feel the sexual tension rising in the air (or my balls) and I left before getting hard. It was always swarmed by tourists taking photos and video, mostly by chance. I mean, getting a selfie with a stranger with a large erection. Only on holiday! I don't see anything wrong with the erections, its natural, but I agree that sexual activity could very well undermine the event and its ever urgent purpose.
Have we ever organised a LPSG meeting up at one of these rides? If it didn't turn into an orgy, it might be nice.