You would be surprised how much science is getting involved in dating these days. It turns out certain type of pick up lines, only work at certain times of day.

It turns out that 'ego depleting tasks', like, holding off on the extra biscuits at lunc, not yelling at the temp when they forgot to pass on an important message, staying late rather than going out for a drink after work or resisting the pair of shoes you love to pay your overdue taxes, all change the way a woman views a pick up line.

When hit on by hot guys at different times, using one of 3 types of line:

1) Direct line (“I don't normally come up to people like this, but I couldn't resist)
2) Innocuous (“Hi, how are you? My name is …...”)
3) Cute  (Excuse me what's the time? I just want to remember the moment we met)

Ego depleted women were more receptive to ‘innocuous’ pick up lines, but less receptive to the ‘cute’ ones.

In other words. If she has had a hard day at work, is on a diet or under stress, shoot for a sincere 'Hi, how are you", rather than being tempted to reach into your old bag of tricks for a classic like,  'did you hurt yourself.?'...when....'The night you fell from heaven'.

It's a real fact that the decisions we have been forced to make through our day, change how we respond to the opposite sex at night.