The 16-year-old star hates it when women try too hard with their appearance in order to grab his attention and wishes they would wear fewer cosmetics.
He said: "I don't like girls who wear lots of make-up and you can't see their face. Some girls are beautiful but insecure and look much better without the make-up, but decide to put loads on.
"I like girls with nice eyes and a nice smile."
The US heartthrob also revealed he does his best to play it cool when speaking to someone he wants to ask out on a date.
He explained to Top of the Pops magazine: "It depends on the situation. But at first I won't let her know ' you've got to pace yourself. Then, maybe by the end of the conversation, I'd ask her something like, 'Do you have a phone number that I could reach you at?' That's usually how it goes."
Despite being a teen pin-up, the 'Never Let You Go' singer was only allowed to start dating when he turned 16 because his mother didn't think he was mature enough.
He said: "Yes, she did say that. But she realised I was growing up, so now she doesn't mind. That was what she said to me when I was younger, but she knows that I date now."
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