Cherchez La Femme

Cherchez La Femme is a perk for female characters in Fallout: New Vegas.

Effects
This perk gives females an additional +10% damage bonus against other female targets and provides special dialogue options with certain female characters, geared at same sex relationships.

Additional dialogue options

 * You can convince the Omerta receptionist in Gomorrah to talk about the Family during the fourth part of the quest The House Always Wins.
 * You can flirt with Corporal Betsy in Camp McCarran if you also have high Charisma.
 * You can sleep with the prostitute Joana for free in Gomorrah.
 * You can convince the generic prostitutes to tell you about Cachino for the quest Wild Card: Side Bets
 * You can ask Sweetie to give you the key to Saint James' room for free.
 * You can respond to Rose of Sharon Cassidy's comment about not liking "soft men" by saying that they're rarely a problem for you. Cass will respond by nervously saying that when she's drunk, she doesn't care who she shares a bed with.
 * You can calm Christine down more easily in the Dead Money add-on and ask about her past.
 * You can access some unique dialogue options, and eventually seduce Light Switch 02 in Old World Blues.
 * Some dialog options with Dala, one of the think tanks in the DLC Old World Blues.

Behind the scenes
"Cherchez La Femme" is a French idiom which translates literally as "search for the woman" and can be understood best as meaning when a man has a problem, there is surely a woman at the source.