Two points here: polygamy is often sexist in nature, and certain groups have forced young women into polygamous relationships.

Polyamory has social pressures of its own right, including the pressure to "get over" (i.e., suppress) issues of jealousy.

I think Elizabeth's point is valid (offering alternatives), though I think few people will take advantage of them, since the myth of romantic love is a powerful and long-lasting illusion, much like other social myths.