You can so see it, it bobs up and down, exactly like an erection.

There most certainly is. You see half of McDowell's penis in a clear, lengthy shot.

This movie had always escaped me, but I finally got to see it last night on TCM. I was suprised by almost no nudity and I think only the use of the "F" word once.

You're seeing things. There is no full frontal (male) nudity in A Clockwork Orange.
"facts are stupid things" Ronald Reagan

Yes you're right about that. Although I think this movie was very careful not showing Direct nudity. I remember Fonda's breast were shown only through her shirts.

Actually, there were movies at that time that showed men's penises. A Clockwork Orange, which came out the same year, contained a full frontal shot of Malcolm McDowell standing under fluorescent light. Woodstock, the rock documentary the year before, showed numerous young men nude from all angles.including a shot of a young man with an erection getting ready to mount a girl in a field. The Last Picture Show, also 1971, had full frontal male and female nudity, as well.

You wrong. That black thing you saw It's just the shadow of his pajamas. It's very clear and they wouldn't have let that seen in the 70s. If you want to watch something real, try gone girl. Ben afflecks Willy is exposed intentionally for a few ms.

Yeah but it's hard to tell. If that is what it was, her leg came in contact so she would have felt it. She doesn't react and they kept rolling tape. I guess we'll never know.
Woman, man! That's the way it should be Tarzan.
[Tarzan and his mate]