Why are sex scandals always about Conservative MPs?

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I'm sure there must be examples from the other parties and I know there have been affairs on all sides but whenever there's a particularly sleazy story, rent boys, suffocating with an orange in your month (?) dirty pics, it always seems to be a Tory.

Or are my recollections biased?

David Blunkett?

I don't associate the Tories so much with sex scandals as the Lib-Dems. Per capita, given that there are relatively few of them, they don't half get around. Oaten, Ashdown, Hughes, Rennard, Laws ... and in the past, Thorpe and Smith. Kennedy had to stand down because of alcohol. Huhne went to prison.