Not so. Rape (and attempted rape) is a messed-up situation, that very often goes unreported, and even if reported, unprosecuted.
"According to the National Crime Victimization Survey, the average number of rapes and sexual assaults during 2002 and 2003 was 223,290 of which 81,310 crimes were rapes; 61,060 were attempted rapes, and 80,910 were sexual assaults. (Ibid.)
In 2003, weapons were present in rapes and sexual assaults 11 percent of the time. (Ibid.)
[MY NOTE: incredibly common: more than enough for 1 out of 10 women in the US EVERY YEAR. And not the armed stranger that we often imagine, either.]
. . . . An average of 140,990 completed rapes, 109,230 attempted rapes, and 152,680 completed and attempted sexual assaults were committed against persons age 12 or older in the United States between the years 1992 and 2000. (Bureau of Justice Statistics. 2002. Rape and Sexual Assault: Reporting to Police and Medical Attention, 1992-2000. Washington, D.C.: U.S. Department of Justice.)
Only 36 percent of completed rapes were reported to the police during the years 1992 to 2000. Thirty-four percent of the attempted rapes, and 26 percent of the completed and attempted sexual assaults were reported. (Ibid.)
A recently published eight-year study indicates that when perpetrators of completed rape are current or former husbands or boyfriends, the crimes go unreported to the police 77 percent of the time. When the perpetrators are friends or acquaintances, the rapes go unreported 61 percent of the time. When the perpetrators are strangers, the rapes go unreported 54 percent of the time."
Source: https://www.ncjrs.gov/ovc_archives/ncvrw/2005/pg5o.html
By the very nature of the thing, there is rarely solid evidence of a crime that can be prosecuted. But if you're hiring a person for a job FOR LIFE, with immense power over all US citizens (more than half of them women) -- exactly what the Senate was doing there -- you want a candidate of unimpeachable character, not someone with serious bad stuff hanging over them who then pouts and growls at the process.