How precisely do you think the things I'm saying harm the marriage as a whole? I'm still not seeing your point. I'm not talking here about causes of marriage failure. I'm talking about the graph structure of society's sexual relationships.
I'm not saying that we shouldn't have monogamous marriages. I'm asking if changing society's expectations to the point where both monogamy and all variations of non-monogamy were perceived to be equally legitimate (with a likely corresponding increase in the number of non-monogamous relationships) could have an impact on the demand for sex trafficking. I don't think making this change would eliminate sex trafficking, but I think it could plausibly help the situation.