How about "no sex before monogamy"? I kind of like that thought. It's from a reality show about match making millionaires, as silly as that sounds it seems like a good rule of thumb.
Me 54 DS19 and DS17 Married 06/1989 Divorced 01/2011
I like that - and I am really a very monogamous person. But that raises the question - when and how do you establish, in a dating relationship, that neither of you is going to see other people?