That's actually a misconception about Victorian Britain. People still boned like mad, back then, it just wasn't spoken of, openly. There were also much higher stakes to sex (read: pregnancy), so sex-for-fun was less common among the kind of women that couldn't dispose of an unwanted pregnancy without raising eyebrows.
The stiff upper lip was a reaction against the Georgians who really were into drunken, orgiastic behavior. The Georgian era was a magnification of the Restoration period, which reveled in the freedoms denied by the Protectorate period (see: Oliver Cromwell).
The popularity of vampires in gothic literature (from the Victorian era) had a lot more to do with xenophobia than sexual repression. There was a relatively large influx of Eastern Europeans into Great Britain, at the time, many of whom still followed folk religions or synchronized Catholicism. They had lower standards of hygiene and little regard for social hierarchy. All of which translated into "rude, filthy pagans" to the British. Mind, the British were finding "rude, filthy pagans" all over the place (see: British Empire), but the Eastern Europeans weren't coming into the country as servants, the way many Africans or Indians were; they were the "rude, filthy pagans" that couldn't be controlled. And, of course, the great fear was that these people would corrupt impressionable young women, hence the sexual angle.