It's sexual harassment alright. Women are just as guilty as men of misusing their positions like that, it's disgusting.

Now, if Spanky is returning the flirtation, then it is just unseemly, and someone needs to tell her it's gross to do it in public- get a fucking room. Maybe then she'll get the point. If her behavior is making YOU uncomfortable, your rights are being violated. No one has the right to to make issue of their sexuality at work, it's not appropriate workplace behavior.

Men often feel what you feel when deciding whether to confront the bad behavior of a woman. You wonder if you'll seem like a whiner, or unable to handle your own business. Well, you're NOT a whiner, and it's not your job to deal with the lewd behavior of your co-workers. Do what you think is best.