The Bible Lesbian Loophole?

A leftover from Yom Kippur a few weeks ago: One of the Torah readings includes the Leviticus list of forbidden sexual relationships...you know, you don't sleep with your parents, aunts, siblings, etc. 

It also contains the famous Chapter 18, Verse 22 that every gay-rights opponent quotes:

"Do not lie with a man as one lies with a woman; that is detestable."

OK. Pretty straight-forward. Gay sex is "destestable," so anyone who follows the word of the Bible should be straight.

Ahhh...but note "do not lie with a man as one lies with a woman." Nowhere in Leviticus does it say "women shall not lie with a woman as she lies with a man."

In other words, where is the Hebrew Scriptures (Old Testament) prohibition of Lesbianism? Not there.