Given George W. Bush has never sexually assaulted anyone and Bill Clinton has, pretty much every female politician not named Hillary Clinton endorses him.
George W. Bush/Jeb Bush 53% 343 EV
Bill Clinton/Hillary Clinton 45% 195 EV
LOL no. Kirsten Gillibrand is probably the only prominent female Democrat who doesn't endorse Bill, and even she doesn't endorse Bush. Maybe the Squad doesn't either, but still they don't endorse Bush. I could see a third party gaining traction regardless.
Also there is no evidence Bill has sexually assaulted anyone, but that's a whole other can of worms. And one could just as easily say he didn't sanction torture or kill hundreds of thousands based on lies while W did, and that's definitely true.
Bill would never make Hillary his VP either; this isn't House of Cards. W wouldn't choose Jeb! either.
That all said, it definitely could be true that Bill's reputation in this day and age hurts him enough with female voters to lose. And shameless Republicans would be suddenly pretending to care about infidelity and to take sexual misconduct allegations seriously again.
I think by the way that if this was like 2012 instead, it would be a Clinton landslide. He was still super popular until the triple whammy of Hillary losing, Dems moving left, and MeToo. While W was still very unpopular until recently, now that people have apparently forgotten all the terrible things about him and/or just think he looks good next to Trump. But I don't think Republicans would be excited about him anymore.