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I think I know this one. They are gay. Just a guess though.
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They are not trying to breed, though it can look like it. When a male mounts another, he is mostly just assuring his dominance over the other.
Homosexuality is an option but most likely they are trying to establish dominance.
You should be happy they're gay! They won't mate! Too many pigs are hard to maintain.
by Jelly Squid
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Copyright © 2017 HubPages Inc. and respective owners.