Girls/women aren't as weak as you think, you can be the sexiest guy alive, but if you don't have the particular things that girl or woman looks for in a guy, it's not going to happen.
be cool, be confident, be funny and witty and charming.
make her feel special, attractive, and smart.
be interested in her mind, not just her body.
be a gentleman, use your manners, treat her like a lady.
do not push for something you want, let her offer it to you.