They interpreted what they thought was the natural order. One of the things that alternately cracks me up and irritates me is referring to prostitution as 'the oldest profession' when early prostitution was a religious rite, not exclusive to women, the "Epic of Giglimesh" notwithstanding. (I'm all excited about reading Tolkien's version)There's a lot of anthropological findings that were clearly female centric, and there were societies where inheritance came down the female line, but certainly didn't make them "matriarchies"-- there may have been a few, but there is scanty evidence to support them actually existing as full matriarchies ( oops, I'm going off on a tangent)
Full breasts or multiple breasts often indicate fertility, which may have been a sign of sexual desirability in women, because thy were fertile. The vulva itself had a variety of meanings, life, rebirth, cleansing, safety etc. Here's a kind of touchy feely article (no pun intended) about 'reclaiming the vulva'--back before the times where it's was considered shameful or 'dirty'--and let's face it, one of the problems with labeling things pornographic, it gives things that feeling of looking at the body disrespectfully.
http://cliterallyspeaking.blogspot.com/2009/04/reclaiming-magic-of-vulva.html
The figurines often have round bellies. Some Goddess's, like my favorite Kalima, were overtly sexual in some aspects, as was more recently an aspect of the Morrígan. So sex was certainly involved, in our stories of beginnings and battles, but generally it had a purpose other than pleasure, although pleasure existed, it wasn't a big deal and was definitely not pornographic. I doubt they needed porn.
Even today, if you go to certain Native American Sweat lodges, some are round in shape and represent the womb, you enter one way, and leave another.
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