> Young associate worked for this partner
I don't know how the legal profession works. But:1. It's quite likely that leaving firm as a young associate carries a huge negative connotation. In other words, her choices might not have been "give a blowjob" or "quit and find another job." It might have been more like "give a blowjob" or "quit and find another job, and maybe not find another job because there's this huge negative on her resume."
2. The law profession has a reputation for being quite chummy. If she had quit over this harassment, even if she filed no charges then it's quite possible that this partner would have gone on the offensive to discredit her character to other influential people.