Homosexuality and heterosexuality aren't about sex acts. They're about attraction and being attracted to the same sex is abnormal, especially in the mammal world. The fact that a small percentage people are exceptions to that only reinforces the norm. The exceptions prove the rule.
Several years ago, I saw a story about a family that walked on all fours. There's nothing wrong with walking on all fours, but the norm for humans is to be bipeds.
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