Bike Anti-Porn - When Things Go Wrong

I don't know. My very early 1970s Gitane came, in its day, with a plastic Ideale saddle which I quickly replaced with a Brooks Professional--- that saddle still lives (on my wife's tourer pending a future rebuild of the Gitane). Absolutely nothing "wonky" about them. On our Merckx MXL, resp. MAX, bikes we have Swift Ti saddles--- these all purchased late mid-1990s (my wife's Swift replacing a Turbomatic she wore out). Have also a number of modern saddles on other bikes, but they'd look out-of-place on, for example, my old Gitane.

It's less to do with the type of saddle more the angle it's set at and seatpost that was paired with.