Okay, now, before you all freak out based on the topic--I know. Sounds like madness.
However, today I introduced Patrick, my white marble DT, into my sorority of four girls. This was not a random decision; I've long harbored the suspicion that Patrick is as asexual as a male betta can get. I had him in a 2 gallon for a brief period of time, and he never even blinked when I added a girl into the tank right next to him. For the last two months, he's been in a divided ten-gallon with two other boys, and still, I've never seen him react to anything. I mean this in the most extreme sense--I've never seen him blow a bubblenest or flare at anything, ever, even though he's very healthy and active.
I've been watching the sorority pretty much non-stop since I added Patrick today, and there've been no problems whatsoever. I haven't even seen anyone posture at anyone else, let alone flare or chase. The girls do seem to be treating him with a bit more respect than they usually give to a new girl, but that's the only difference I've seen.
So, has anyone else ever attempted this and had it succeed? And just for clarification, I don't plan on leaving him free-swimming in the tank tonight; I was going to take a little 1 gallon plastic tank, rig it to where it's attached inside the 10 gallon, and then leave him there while I'm not around to keep an eye on him.