Is he smiling at you, or does he smile at everyone?
It will improve your chances for a long-term relationship.
Decide whether to confide in colleagues: If you don't want to be a regular feature of office gossip, it might be best to tell a few close colleagues about your romance.
That way people lose the intrigue and friends won't feel excluded.
Given the amount of time we spend at work, it is little wonder that many people find their passion and excitement in the office.
One in three people has a romantic liaison with a colleague and 28 per cent of British working women say they have had sex in the workplace.
But secret trysts in the boardroom and chance encounters in the lift can bring misery as well as intrigue to your working day.
Whether you're already romantically involved at work, or just thinking about it, here's how to be ten steps ahead of heartache - and unemployment.
Leave him if he's married: You will win very little support for your relationship and you run the risk of his wife/girlfriend turning up at the office with a large tin of paint for your car.
Relationship psychotherapist Phillip Hodson says: 'It's not a crime to fancy someone but when there are families or other halves involved, you have to think of the consequences.'Flirt discreetly: Discretion is the key to a successful office romance.