Yes, it usually does. Outsiders don't realize that and imagine jealousy, etc. But bonds usually do increase as a couple shares with a 3rd person sexually. Your bi nature sounds ideal for such a relationship.
Excellent description of your response to pegging! I am generally submissive but one of my pleasures is pegging my husband. He reacts so intensely when I do it! Your comment reminds me of that.
That is a good example of how males can be trained. I congratulate you on teaching yourself as you did, especially at that age. Did you have any particular motivation to do so?