Girls are weaker creatures, once you promise them either heaven or earth, they will believe. This shows that girls are likely to fall for you if you can say something to entice them.
What a sexist comment! Of course, on average women are physically not as strong as men. You are depicting them as gullible. Women as no less intelligent than men. If fact, I think that women can be much more intelligent than man sometimes. If we're talking about emotional intelligence, I think women may tend to have more than men. If you're all talk an no actions, women will see right through it. It may take them a little while to realize it, but they will. You need to show a woman you deserve her by your actions, not just empty words.