WarpMyMind

What's the best free temperately file that transforms me into a female?

*bump*

Well, judging by the description (it doesn't say anything about real-life effects), try TrigFemaleForm. FemaleDreams might be something to try, too.

I think what I am looking for is Triggers that won't cause permanent changes in my body

Yeah, like I said, TrigFemaleForm. The description says nothing about real physical changes. Just mental. And the FemaleDreams one isn't a trigger, but it also does not indicate that it's permanent.

Physical Change always results in permanent change?

that, i assume, is highly probable.

The illusions and mental visualizations are for you only, but to make the dream real for others to percieve would either require really strong automatic telepathy or "permanent" change to your physical body

but of course, your mileage may vary.