Best to try to stop those who are engaging in a deadly behavior.
I would target the basic behavior that is deadly. It sounds like you would attempt to allow that behavior but to control it.
That was also the argument with condoms....it has proven ineffective.
You can't stop it. It is ingrained. And I would contend that the best way to limit promiscuous sexual behavior is to allow permanent unions of homosexuals. I fail to see how this in a any way affects heterosexual marriage, but denying this right does seem to encourage the very behavior you claim to worry about.