I am not saying Ansel had affairs or was unfaithful to his wife, just that there was apparently an infatuation/crush/lust in his heart(like Jimmy Carter?) that added spice & excitement to his life & influenced the life in his images at the time.
The Westons lifelong images of quality may well suggest a correlation to creativity & the idea of exciting the libido.
Others who produce excellence and are faithful to one partner may well find all the excitement & stimulation they need with one person they are fully committed to & in love with.
Might make an interesting study for some grad type in need of a topic for a thesis or dissertation.