Because the people who have the power to make lobbying illegal are the ones receiving all of the favors from said lobbyists. Taxpayers are going to pay their salary regardless of whether or not they actually listen to their constituents.

Basically, because this woman is bringing in weird and gross variables (sexual activity of women) into analyzing relationships, she can't say "this is the only variable that matters!" If she's going to get gross and weird and sexist, she's going to have to consider other gross and weird variables in there too. Like…

Weird, from her video I assumed she was married to some kind of sentient spreadsheet.