I went 12/12 with bagseed in an 8x4 tent with coco/perlite D2W hyddro, GH trio nutes (I know stfu) CFL/MH...thought it was a fucking miracle...my partner left peels all in the tent.
Its proven that decaying bananas produce ethylene, its proven that ethylene tells a plant it should decide to be female...
Its proven that the sex of the plant isn't determined until around week 3. Even with "feminized" seeds you can still produce a male if the conditions are shitty enough.
The science is there and my personal experience is there. I'm using fuckin' banana peels and any other organic mat that produces ethylene.