Why has the ideal male body not changed over time?

Anonymous
The ideal female body has changed a lot throughout time, but it is not the same for the male body.

Examples:

Ideal Male body circa 1500s: link

Ideal Male body 2000s: link

Ideal Female body circa 1500s: link

Ideal Female body 2000s: link

Updates
+1 y
And by 'ideal' I mean society's ideal. Not necessarily what every woman or man sees as the ideal physique for the opposite sex.
Why has the ideal male body not changed over time?
11 Opinion