The point is: SHE DID NOT NEED TO COOPERATE! Like Bathsheba, like Rahab, like Sarah in offering her servant, she willingly acceded to, and thus promoted, man's basest drive. Yes, it was a patriarchal culture, but God transcends culture. That picture, in my view, forces us to focus on this otherwise-unstated issue.
As it does so often when relating these real-life stories, the Bible leaves it to us to ponder on God's truths. Why, when the Gentile Ruth was so desperate, didn't she simply offer herself to the fieldhands? Now there is a woman who earned her crown in Jesus' ancestry. Rahab came around, and she's in it, too.
Esther finally shaped up, too, so we have her story, and some now call her "saint." But let's not forget how it began.
Every Saint starts out as a Sinner.
However, not all sinners end up as saints.
It’s a Narrow path.