There are several things that don't add upp with the season 5 flashback. For example in the season 6 premiere it was revealed that Brandon and Valerie never had sex because the minute they took their clothes off they started laughing. It was a mutual descision and they both agreed that it would feel too weird for them to hook up. While in this episode Valerie states that she did everything to get Brandon in bed but he was the one who refused. She said that this happened when Brandon came back inside after having talked to Kelly. So when did they take their clothes off? They didn't do it before Kelly showed up and it would seem weird that Brandon (and Valerie) would take their clothes off after he decided that they should remain friends.