JLP, you forget I used to live in Greece. Don't forget that there is a slight problem with hirsuteness there.

I think that when Penelope and Odysseus first got together, he told her that he was poly and she couldn't really deal. They broke up for, like, a month. Then she realized that if she could be his primary, then she could handle it. The main rule is that he has to tell her every woman he gets with, but no details. He's also only allowed one encounter per woman per pan-Aegean war. She can't really handle the complexities of a poly relationship, even of having non-emotional sex, so those suitors were out of the question.