I don't know many who think that porn actresses are doing the right thing from a feminist agenda perspective.
Almost every feminist I know has zero problems with porn actresses, and, the ones I know who have problems with porn itself have issues with the porn industry and the way it is run, not with actresses within it. I wonder how many feminists you've talked to about sex positivity? Sex positivity is a HUGE feminist movement and it absolutely embraces the idea of empowered women doing consensual porn.
Given your particular genre, I'm not surprised that most feminist you know are sex positive. However, the fact that "sex positive feminism" (rather than just "feminism") exists as a movement is a tacit admission that feminism (as originally conceived) was anything but. It's the latter that I'm criticizing.
I do recognize, however, that some modern feminist identify as sex positive, though they are still in the minority from my experience.