Most people who are sexually active are voluntary so, so let's just assume people are not talking about sexual assault when talking about an active sex life.
You’re presumption is so bad it’s not even wrong.
> “Nearly 1 in 5 women (18.3%) and 1 in 71 men (1.4%) in the United States have been raped at some time in their lives, including completed forced penetration, attempted forced penetration, or alcohol/drug facilitated completed penetration. [0]
It's closer to 15%.
https://www.rainn.org/statistics/scope-problem
EDIT: Wow people really hate rape statistics.
So rape ends up being epidemiologically-relevant to STD vaccines, but there's a lot of folks who would rather not confront that — even here on HN.
Fortunately, this is irrelevant. Given the severity of HIV, the full 18% figure can be safely taken at face value, for society-level disease prevention purposes. HIV is both expensive and deadly and vaccination is cheap.
If that is the question, it's based on some abhorrent moral assumptions.
Much of the opposition seemed to come from a vengeful kind of religious conservative who wants sex to have negative consequences. Those conservatives represent a familiar kind of evil.
Yet I suspect that some opposition also came from women who had a problem with protecting men's sexual health. This is a newer kind of evil, and even less sensible for women who are heterosexual, for the herd-immunity reasons I outlined in my first paragraph.
A more-widely-administered HPV vaccine was literally a win-win for everyone, gay and straight, female and male, and still it came about slowly and faced opposition. This made me despair of my fellow humans.
But sure, that works when people do it. Just like social distancing.
Relying on other people's good behavior at a large scale is a bad plan though.
Also not sure which number of partners brings the most frustration or alienation. One? Three? Zero? Each situation seems to bring its own problems. Life is suffering.
("One" is the best plan for most people, but it depends a lot on which one...)
Regarding HIV, why not get vaccinated if you have easy access to it? What is the harm in being immune to HIV?
People are frequently unfaithful without their partner's knowledge. Healthcare workers/Dentists are at an elevated risk of infection, and by association so are their partners. As are law enforcement, and their partners. If you routinely interact with the homeless professionally or as a volunteer, you're at an elevated risk.
This is the same mentality that was so tragically wrong and disproven by the data numerous times, no? Girls grow up and eventually have sex, right? Sex is a very human thing, and proclamations about monogamy or abstinence tend to be more religious/cultural signaling than reflections of people's actual behavior or the real need for people to get vaccinated.