The Senate recently passed the Franken Amendment, which basically prevents a company who receives a federal contract from requiring mandatory arbitration of sexual assault cases.
Senators Crapo and Risch voted against this amendment. I just checked their websites, and neither has an explanation of this vote. I cannot imagine a good reason to vote against allowing a person a trial in sexual assault cases. Technically, you can file suit after an arbitration, but the issues are limited and it's difficult to get beyond the arbitration ruling and get into court.
The only reasons I can think of that would cause them to vote against the amendment are 1) party leaders spoke and they followed, and 2) they are the Party of No. I guess those two reasons are sufficient to overrule any concern they might have for victims of sexual assault, primarily women.