Would you date your friend? Here's how to go from mates to lovers

Hands up if you've never developed a crush on one of your male friends. Well, look at that - no hands. Thought so.

I'm not saying guys and girls can't ever be mates, but when you spend enough time with a member of the opposite sex - and have a pretty awesome time doing it - the odds some feelings will start to develop sooner or later are high.

According to relationship psychologist John Aiken, "attraction is influenced by people you spend a lot of time with and also who have similar interests and values to you".