From what I have read here:
http://ffxiv-roleplayers.com/wiki/index.php?title=Category:Miqo%27te
The males nuhn don't necessarily have a harem but they are the breeding male and thus that implies that they breed more then one female. It doesn't say how the females the nuhn breeds to are chosen. It could differ by tribe or be the males choice, females choice, etc. Also it doesn't specify that the challenge for nuhn is strictly a physical challenge. The nuhn thing only effects breeding so females could essentially love and be in a relationship with a specific tia, just that breeding is for the Nuhn for the strength of the tribe the tia would allow the Nuhn his breeding rights. Kind of like a King in medieval times having his way with females under order of the law. That's how I see it anyway.
http://ffxiv-roleplayers.com/wiki/index.php?title=Category:Miqo%27te
The males nuhn don't necessarily have a harem but they are the breeding male and thus that implies that they breed more then one female. It doesn't say how the females the nuhn breeds to are chosen. It could differ by tribe or be the males choice, females choice, etc. Also it doesn't specify that the challenge for nuhn is strictly a physical challenge. The nuhn thing only effects breeding so females could essentially love and be in a relationship with a specific tia, just that breeding is for the Nuhn for the strength of the tribe the tia would allow the Nuhn his breeding rights. Kind of like a King in medieval times having his way with females under order of the law. That's how I see it anyway.