Are you talking about between male adults and underage male teenagers?
Name any recent Republican Congressmen that has had a consensual affair and that hasn’t been forced to resign or retire or put out of office?
By definition, underage people cannot give consent.
I like how you put "Congressmen" in there so we couldn't name Trump, but regardless, Democrats don't have to power to force Republican Congressmen out. They resign (or lose elections) because they're own voters give up on them.
It seems likely Lindsey Graham has had consensual affairs.
Newt Gingrich had an affair in 1974 and served in Congress until 1999.
Boehner was rumored to have had affairs.
Don Sherwood had an affair and only left when he lost an election
David Vitter admitted to sex with prostitutes and served in the Senate for 10 more years.