People who are valuable don’t need to tell others that they are, it shows. Being valuable can go from getting the highest grade in the class (yes, women like smart men) to taking pride in having the nicest garden. I’m taking a really wild example here… but if you are really passionate about gardens and you spend all day perfecting your garden, then at the end of the day you will glow of pride and confidence. This makes you valuable, to yourself. Feeling valuable leads to others finding you valuable and consequently attractive as well.