and, as you say, you get women who thing they are so beautiful they must be great in bed, or are so insecure that they drive you insane.I would agree. But these two situations would not be common enough in my experience to level a generalisation at all men - i.e. that we either whine on about not being big/good enough or think that our knobs should be worshipped.
the 'men are obsessed with their dicks!' thing?
i think it's more 'men are obsessed with that they want to be doing with their dicks!' in meaning, but that's not as catchy.
and, of course, the fact that so many men seem to adjust themselves in public. from your POV, you don't want your balls squished or your junk stuck together. from our POV is looks like fondling and checking it's still there.
not helped, of course, by freud's penis envy theory.
the medical establishment, largely male, thought their dicks were so awesome that everyone must want them.
plus sex, for women, is more of a whole body thing. the average man seems to care less for neck stroking as long as the todger is touched.