Actresses were ready to trade sex for roles... because directors were abusive pigs who expected their "Director Rights to be Respected" as a matter of course.
Who believes that it started with the actresses offering sex?
It actually started with early actresses being recruited amongst prostitutes, because the profession was considered to be unbecoming to a woman of good reputation.
Now, ignore the bit about prostitutes, it is a distraction.
Concentrate on how the patriarcal society of the time was controlling women's sexuality and judging women by their "virtue": this is the source of the evil that is now being exposed. This is the starting point of the cycle.
So let's not blame actresses offering sex, no more than we can blame some choir boy to be "tempting" the "innocent" priest.