Why did Lot offer his daughters?

This site tells a little about why Lot offered his daughters:

http://www.bib-arch.org/reviews/review-sex-in-the-bible.asp

But what do we do with Lot’s offer to hand his virgin daughters to the crowd of Sodomites? Since the Bible does not condemn this offer, but only its refusal by the crowd of Sodomites, I would assume that a completely different code of sexual behavior than ours is at work here, a code that does treat women and their sexuality as the property of their menfolk to be appropriated at will.

-From a book review of Sex in the Bible by: J. Harold Ellens. The book review was writted by: Tan Ilan

Tal Ilan received a Ph.D. from the Hebrew University in Jerusalem and was guest professor at Harvard and Yale. She is currently professor of Jewish Studies at the Free University in Berlin, Germany.

There are a ton more sites that talk about this topic, this is just one explanation.