Funny thing is, you know that in every meeting there'll be on this, there's atleast a couple of MPs, or female MPs whose husbands are, regular visitors to WGs. Or more likely rent boys, weird mosley-style orgies etc! Or people like Whittingdale who had no idea his girlfriend was a hooker (yeah right).
You know that MPs like Harman are in the minority, but they just shout the loudest, and everyone else is too embarassed to do anything about it. Same with the drug thing-most know that things need to change, but know that if they're the campaign leaders, it'll be mocked-up newspaper pictures of them looking stoned with spliffs photoshopped into their mouths. That's one of the very few ways I feel sorry for MPs.
To paraphrase Alan Partridge: "Nobody wants to be tarred with the whore/drugs brush"