Liberace appears to have had a homosexual relationship, but he himself denied it. "Gay" to me implies a person who openly embraces a lifestyle including exclusively homosexual sex; under such a definition he was not gay. Indeed he won a libel case against a newspaper and stated he wasn't homosexual and had never taken part in homosexual acts. His supposed live-in lover also failed to show he was homosexual.

There's evidence to suggest he was [also] interested in women. Wikipedia doesn't mention it but a BBC article, http://www.bbc.co.uk/news/magazine-22099082, says he was engaged. Of course that could have been a way to court interest from [female] fans; but it seems equally others could have lied about the extent of his homosexuality. Often people mistake flamboyant-camp for homosexual, it's possible to have either without the other.

The whole Wikipedia page for Liberace appears to be an attempt to force him in to a mold that he refused repeatedly. Perhaps he was asexual as some reports hint, or maybe bi-.