Transcript for Ex-Cop Accused of Killing Wife Testifies
Kids should be off-limits. There's a new app that lets women judge their behavior. I knew you were going to go to the sexual performance. Of course. Of course. You're perfect, as always. Well, check the website. It's the app called lulu. Robin, stick with us. Aditi roy. Reporter: You might go online to find reviews. Now, two women have launched an app that applies that principle to dating. It lets women and only women rate men. And lets other ladies see those reviews. Have you looked up your guy friends and guys that you know? Yeah. We have. Reporter: Kimberly and tasha are college sophomores who use the app called lulu. It's great. But there's tricks. It's unfortunate for the guy that is subjected to this. Reporter: The site has 1 million members and growing. Alexander chong and alexandra schwartz calls it dating intelligence research. This is for women to pool the knowledge. Reporter: Others like professional matchmaker like paul, call it shallow. The theory of the application is really, really good. It's just the execution of the application is not so great. Reporter: Here's how it works. Once you sign up, the app uploads all of your male facebook friends. Boyfriends, ex-boyfriends, to male friends, crushes and the hookups. You can check out their ratings and rate themselves yourself. Answering questions and using playful hash tags. Kimberly showed jared his ratings. A lot of ladies have been looking at you with an average score of 8.1. Good. Reporter: The college sophomore found out he has an epic smile, can't take a hint. And is a man-child. These ladies say lulu is entertaining. But they'd rather rely on their intuition that separates the men from the man-child's. For "good morning america," aditi roy, abc news, new york. What will they think of next? I know. But everyone thinks it's funny when it comes to men. If there was something like that about women, we would be up in arms.
This transcript has been automatically generated and may not be 100% accurate.