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The line for me is consent. Homosexual couples can give knowing consent, heterosexual couples can give knowing consent, polygamous couples (or triples or quadruples, etc.) can give knowing consent and incestuous couples can give knowing consent. I know a lot of people will have trouble wrapping their heads around those last two, but no one is forcing you into those relationships so it's really none of your business. Even if the people next door are in a polygamous homosexual incestuous relationship, it's none of your business just like a heterosexual couple is none of your business.
Children cannot give consent, animals cannot give consent, and non-living objects cannot give consent. Also, some mentally disabled people cannot give consent, which might also cause some head-wrapping troubles.
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