I am a single male, and I haven't had much experience lately, BUT, my first expereinces were with my friend and his several wives...serially that is! We "all" connected sexually with each of his wives, and his wives with me, sometimes the attractions between the three of us would be immediate, sometimes it took weeks to months, to "evolve", but "always" my relationships with my friend and his wives took a very strong sexual turn, and we "always" had a good time sensually and sexually, but that was "never" the cause for their marraige breakups. That was just the most often of causes, "money". So, my "first" time was with my friend and his first wife. I remember that so well even now, "fondly".
Michael