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For me it's the trust issue. And the respect issue.
Don't get married unless you're ready to stop kissing and fucking others. Or be honest with yourself and your partner before you say 'I do' because you know yourself--if you can't be faithful, you know it and you won't. Have the balls to say it up front and make an arrangement. If it's one you both can live with, you've got a partner.
If one can't live with it such 'modern' arrangement, then you need to keep looking and respect your lover enough not to bullshit her into thinking this is to 'honor until death do you part,' when it's really 'to mostly honor except when I'm just feeling a bit mischievous and horny.'