Lyndsey McElroy, played by Courtney Thorne-Smith, is Jake's best friend's mom gone Alan's girlfriend.  She also happens to be Judith and Herb's neighbor.  Oh her seedy back history includes a softcore porn.

Lyndsey McElroy Quotes

Charlie: Give me in the lay of the land.
Lyndsey: You mean who in this land can you lay?

Lyndsey: I'm way past guys like you.
Charlie: What do you mean guys like me?
Lyndsey: I mean guys I have to dip ammonium before I let them anywhere near me.

Two and a Half Men Quotes

Charlie: Oh, try MalibuPuddingGirls.com.
Alan: Pudding Girls?
Charlie: Trust me.
Alan: Oh ... ew.

Chelsea: I just think it's ridiculous that we're engaged and we're not living together
Charlie: Well excuse me for being old fashioned. I'm just not comfortable with us living in sin
Chelsea: So you think we should stop having sex?
Charlie: No no, it's not the sin I object to, it's the living in it