Irene's first language is innuendo. She's not flirting, exactly- she does prefer women- rather, she does it to provoke a reaction, because when she's the one acting rather than reacting she's the one in charge.

Which is always nice.

She takes his hand, smile still in place, and gives him a firm handshake. "Irene Adler. No trouble, I like talking to strangers." There's a quirk in her smile. "Mainly because I was told not to as a child."