Monogamy or Polygamy?

Out of curiosity, say if you're 'seeing someone' (but are sleeping with them), do you only have sex with them (and no one else - monogamy); have sex with whoever you want (until it's official/agreed that you are exclusive - polygamy) or have another arrangement (explain in comments)?
Monogamy
Vote A
Polygamy
Vote B
Other arrangement
Vote C
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Monogamy or Polygamy?
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