Marital Relationships

Now before you get scared this is not a R or X rated post... :) Andy and I just had a lot of time to talk on the drive to and from Birmingham this weekend when we went to pick up our stuff from Andy's parents. The main thing we talked about was how do you handle relationships with people of the opposite sex after you are married and what is an appropriate level of friendship. When we first got married we agreed that we were never going to be alone with someone of the opposite sex just to rule out temptation. It has been very easy to apply this rule and have realized that since we got married the only friends we have made have been couples that we both get along with well and when we meet someone think about whether or not both wives and husbands will get along. The issue we were talking about is what do we do with friends from before we got married, or from before we were even dating? How do you handle it when a majority of them are still not married and many aren't even in a relationship? The biggest thing was what do we do about people we were physically attracted to before our relationship, but our partner has become good friends with in the mean time? Do you ask that the friendship be broken off or just be a surface friendship? Neither of us are very good at surface friendships because we read people to well and either really like them, or can't stand them so we decided that would not work. We went back to our first inclination which was that the friendships can continue and grow as they will, but that we would never be alone with people. I don't want to put Andy in a situation that might lead to temptation and could have been easily avoided, or vice versa. Does anyone have advice on this?