It sounds like your problem with the article is that its "mother goddess" interpretation is baseless because there is no written record of that time period. That's valid, except you then proceed to offer your own modern interpretation that is equally as baseless. Just because we are inordinately pre-occupied by porn today, doesn't mean pre-historic people were. If anything, they were hungry, hand-to-mouth wilderness survivors so those big-bellied women are much more likely to symbolize a well-fed person than a pornographic ideal (especially since breasts were not the sex symbol they are today for much of human history, and neither was masturbation to external visual sources). Or they could be literally anything else - kids toys, voodoo dolls, whatever. Like you said, no written record = speculation.

Also:

the ancient artists of surviving ancient art were mostly teenage boys

Sources?

Edit: Anyone care to reply instead of downvoting?