Where on earth do you get these ideas? The gossip of the ancient Greeks and Romans about their neighbors and competitors? There is actual
scholarship in this field, you know.
If nothing else, at least start with Wiki:
http://en.wikipedia.org/wiki/Etruscan_society
"The princely tombs were not of individuals. The inscriptional evidence shows that families were interred there over long periods, marking the growth of the aristocratic family as a fixed institution, parallel to the
gens at
Rome and perhaps even its model. It is not an Etruscan original, as there is no sign of it in the
Villanovan. The Etruscans could have used any model of the eastern Mediterranean. That the growth of this class is related to the new acquisition of wealth through trade is unquestioned. The wealthiest cities were located near the coast.
The Etruscan name of the family was
lautn.
[1] At the center of the lautn was the married couple,
tusurthir. The Etruscans were a monogamous society that emphasized pairing. The lids of large numbers of sarcophagi (for example, the "
Sarcophagus of the Spouses") are adorned with sculpted couples, smiling, in the prime of life (even if the remains were of persons advanced in age), reclining next to each other or with arms around each other. The bond was obviously a close one by social preference
It is possible that Greek and Roman attitudes to the Etruscans were based on a misunderstanding of the place of women within their society. In both Greece and Republican Rome, respectable women were mostly confined to the house and mixed-sex socialising did not occur. Thus the freedom of women within Etruscan society could have been misunderstood as implying their sexual availability.
It is worth noting that a number of Etruscan tombs carry funerary inscriptions in the form 'X son of [father] and [mother]', indicating the importance of the mother's side of the family."
http://scholarworks.umass.edu/cgi/viewcontent.cgi?article=1153&context=etruscan_studies
https://books.google.com/books?id=2...=marriage in Etruscan society society&f=false
Nothing was more sacred to the Etruscans than the family unit, and that included verified lines of descent from both father
and
mother:
http://www.inter-disciplinary.net/at-the-interface/wp-content/uploads/2013/03/sandhoffewfpaper.pdf
Ancient Marriage in Both Myth and Reality:
http://www.cambridgescholars.com/download/sample/57805
In five more minutes I could compile a list of dozens of scholarly references, but an analysis of Etruscan marriage is off topic. If you wish to discuss Etruscan marriage habits perhaps you might care to open a thread about it or add to an existing thread on their culture. However, the scholarship is what it is and it bears no resemblance to what you stated in your post.