[Rex Anderson]

Although those diseaes are "behaviorally obtained," it's not necessarily true that everyone who gets them has done so through improper behavior. For example, a young woman who's a virgin marries a man who isn't, the man having acqired HPV from another woman, and that man gives the HPV to his innocent bride. The bride would have been a lot better off with the vaccination than without it.

Exactly right

[aruanan]

For example, a young woman who's a virgin marries a man who isn't, the man having acqired HPV from another woman, and that man gives the HPV to his innocent bride. The bride would have been a lot better off with the vaccination than without it.

More accurately: For example, a person who doesn't have HPV marries another who does, who then infects the uninfected spouse. The formerly uninfected spouse would have been a lot better off with the vaccination than without it.