I'm not really sure how I'd "source" this. I'm not a lawyer by any means either, so someone please fill me in if there are any legal paradoxes in this. My opinion is this, however:
"Violent" rape should be five to ten years in federal prison, longer for especially heinous crimes like gang rape. At least five years probation, plus registering as a sex offender for life. Violent rape would be any sexual contact to which the victim has given a clear and distinct "no".
Crimes such as rape by fraud can be slightly "less" serious in my opinion, depending upon the circumstances, but should be punished similarly as above. Still very slimmy.
Cases of drug-assisted sexual assault, in which the victim didn't consume or imbibe the drugs voluntarily, are on the same level as violent rape and should be punished similarly. This being said, most victims consume the drugs voluntarily, with the alcohol being consumed by the victim in anywhere between 30 and 79 percent of cases. Alcohol is, hands down, the most common drug consumed in sexual assault cases.
TBH, I don't have a lot of sympathy for people who get wasted and are raped. I certainly don't wish such a fate upon anyone, but there is most definitely a limit to how reckless you can be with your own body, after which point you must stop and begin to judge your own actions. This doesn't excuse the rapist, however. In cases like the Stanford case, 1-3 years in federal prison + 5-10 years probation + monetary restitution seem appropriate. For instance, I don't hold a ton of sympathy for the woman in "The Hunting Ground", but the perpetrator deserves punishment and she definitely deserved the million dollars from FSU, given how poorly they handled the case.
Cases in which there wasn't a distinct "no" and drugs weren't involved are up to the judge's discretion, but generally shouldn't even reach the prosecution stage or have sentences over a year. The only reason I say this is to make exceptions were victims are blackmailed or threatened into sex.
"Yes means yes" unfairly criminalizes young men and puts too much sexual power in the hands of women. Women can simply have sex enthusiatiscally, purposely avoid the word "yes" (which, IME, women seem to avoid saying to begin with) and control the situation.
Overall, it's a tricky situation and one that is hard to place without knowing the details on a case-by-case basis.