I've done this before and it's never really been that big of a deal bc it always ends up that one of them is a male. I wouldnt call it an ideal situation, but it can be a solution if you dont want to go spending money on pots and extra soil.
I got two females in a 20 gallon of promix. I had started some female seeds and seems one container got two seeds in it. I figured f it Ill experiment. I twisted the stems together a bit to see if they would fuse. They are with my other plants however the ones which were twisted are half the size. They seem to be root bound or some nonsense. I dont have any pics though there is a video on swap