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If you are talking about protection against STD's, then I'm not sure why someone would be in a relationship anyway with a person they think might bring home STD's. Honestly, that's something that falls in the realm of trust for me. I don't think my hubby would every bring that home, because I trust him, so I don't plan on second guessing that for the rest of my life because he might decide to cheat one day. So, IMO, in a trusting committed monogamous relationship I don't think anyone should be using condoms for more than the control of pregnancy, or else it just seems weird to me. But to each their own.