Richardson High School, a public school outside Dallas, hosted a religious motivational speaker who is known for his dating rules that teach girls they need to talk less and be more mysterious to get guys to like them.

But Justin Lookadoo isn't just a motivational speaker, he's also co-authored books likeHis website, RUDateable.com , offers tips and quizzes on how to be liked by the opposite sex.

In an attempt to end the assembly, concerned parents apparently contacted the Texas Freedom Network before the show, TFN Insider reported . Though officials originally postponed the talk, they then decided to go forward with it, but made it optional.

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On his site, Lookadoo offers rules on how to be "dateable," with the first rule for females being "Accept your girly-ness."

"You're a girl. Be proud of all that means. You are soft, you are gentle, you are a woman. Don't try to be a guy. Guys like you because you are different from them. So let your girly-ness soar."

Another tip essentially tells girls to be seen and not heard:

"Dateable girls know how to shut up. They don't monopolize the conversation. They don't tell everyone everything about themselves. They save some for later. They listen more than they gab."

In order to be a "dateable guy," Lookadoo and co-author Hayley DiMarco say they have to be "stronger, more dangerous, and more adventurous ... Dateable guys are real men who aren't afraid to be guys."