What if there was a third sex?

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(Image source: Proyecto Agua on Flickr.com)
1. Fathering children and pregnancy would be more prone to error
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2. Families would be more stable and have more resources at their disposal
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3. Two people could be together and still be single if they are missing the third
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4. Sexuality would be more varied
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5. There would be different forms of homosexuality
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6. What would the connector, which requires three parts, look like in concrete terms?
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Or would the act of love happen sequentially? Perhaps there would also be some kind of spawning (like in fish and amphibians).
7. Within the relationship, there would be changing alliances: two against one
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8. Each child would have nine grandparents
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9. No sex would be able to be dominant in the long run
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Unless there were also significant size differences
10. The teachings about sex and gender in our universities would be more reasonable
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11. Perhaps clear gender roles would be needed to make a distinction possible
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Or one would only learn the sex of another person upon request
12. Relationships would be more tenable because it would be harder to find everyone involved
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