As far as dating sites go, the most important thing I know is "Never lie about who you are." I learned that before I became a billionaire but after I was a world class model and action star. Right about the time I was awarded "Worlds Best Lover" while I was a spy for her Majesty's Secret Service. This is the same advice I gave to the Pope and the President over drinks one night after hang gliding out of a remote village in the Andes where I had performed emergency surgery on a child. "Never lie about who you are." That was the subject of conversation as I cooked their gourmet dinner. An important rule to live by.
*Actual Seriousness* I can be serious, in fact I am most of the time due to work, but it's not who I am. I don't see the point in spending your life trying to look cool, be an adult, or missing out on fun and wonderful things because you needed to "act" like an adult. Theme parks are built on the very idea that we don't actyally want to behave like grown ups. I know when it's appropriate to be an adult about a situation but I also know when it doesn't matter at all.