Yep! Start with two KNOWN females (clones are great for doing this). Reverse one with STS/CS & use the pollen produced by it to "inseminate" the other. You can either collect pollen in advance & freeze it for future use (then give the tent a bloody-good clean, soas not to get stray pollen into a subsequent run), or do it the way I did, with a staggered introduction of the recipient plant. Then clean the tent anyway.
You can even spray a single branch of one plant & let it self-pollinate the rest of the plant, but I've read somewhere that's not neccessarily best-practice.
The "donor" is fundamentally female, so the pollen you're forcing it to produce will have the same female chromozome, so you get feminised seeds as the outcome. Kinda like forcing them to have hot lesbian sex, but actual offspring are produced, rather than just getting sweaty & messy
I don't understand the biology behind it (something to do with suppressing ethylene), all I know is that it works. All the seeds I produced & grew-out were females, with no signs of hermies at all.
No more getting packages from O/S nabbed by Customs
Shh... You can even do it with autos, but you have to start them a couple of weeks apart IIRC.