More than that and the man is likely to be a time-waster.
The book was translated into 27 languages and helped a generation of women find their Mr Right. Now texting, Facebook, Twitter, Skype and online matchmaking sites have revolutionised the dating landscape.
It's more complicated than ever to manage your romantic life. Our new book tackles exactly that question - and here, in an exclusive extract, we show you how to handle texts, emails, Facebook and online dating...
Social networking means rejection can be broadcast to the world.
An ex can announce the break-up on Facebook or that he's 'finally single' on Twitter.
Date or make friends with people in other cities or even countries.
Travel to new and exciting places or meet someone while waiting for your flight. What better way is there to pass the time if you have a delayed flight?
The same rule applies to texting and all other social media.
So NEVER ask men out by text, Facebook or on instant messenger.
Meeting someone new at the airport is fun and exciting.
We've all thought about it while waiting for our flight.
It's too painful and gives you false hope when you should be moving on. Remember, less is more and that most men will look at photos and skim the content, anyway.