Who was blackmailed so far about sex? Can you name one or two? Or you just are imagining future problems. I think voters are so used to see sex affairs such as Bill Clinton, they are not going to be seated because of illegal sex. Focus on pocketbook issues. It is what drives voters.
I can give you one historical example that I am very familiar with.
Here is the man:
https://en.wikipedia.org/wiki/George_J._Mitchell
He was Majority Leader (Democrat) of the US Senate from 1989 to 1995 from the state of Maine.
He was considered to be a man of very high character—trusted by presidents and members of congress on both sides of the aisle.
You can read from link all about the issues where he increased the cost of living for every American—which still affects us today.
What does this have to do with sex?
Well it turns out that he was on the list (released years ago) of folks who routinely flew to Epstein island and was photographed and filmed having sex with whoever...
Anyone who had access to those videos and pictures owned that US Senator and could heavily influence critical parts of US domestic (and foreign) policy.
If you are interested in how critical “just sex” has been and is in affecting every single aspect of American life these books walk you through the details—blow by blow:
https://www.amazon.com/One-Nation-Under-Blackmail-Intelligence/dp/1634243013
https://www.amazon.com/One-Nation-Under-Blackmail-Intelligence/dp/1634243021