I like how you've put "I haven't tried, so I wouldn't know
yet". Implies that it will be tried sometime
Being said, I voted for that one. I haven't tried it yet, but would absolutely love to. I'm sure I would love it, as I have enjoyed dildos/vibrators there. Just haven't had the chance to try out a real cock yet. I'm currently dating a ggirl and we've being going out for several years. If the chance arises and she's okay with it, I wouldn't mind a threesome with a tgirl. It will have to be agreed upon by the both of us though. I would never dream of doing anything behind her back.