So, your justification for same s** relationships in humans is because lesser animals partake in it on occasion? Animals also cannibalize one another at times, they eat their own feces and vomit, they eat afterbirth, they sniff each other’s butts, etc. The only way you would have a valid argument for justification, would be if we humans adopted all their behaviors as our own!

Also, same s** relationships within the penguins is an extreme rarity and it’s only due to the fact that penguins cannot tell a male from the female under certain circumstances. When they do 99.9% of them ditch their same s** partner and find a proper mate.

Stop listening to uneducated morons and regurgitating their nonsense! It’s seriously not that hard to educate yourself with non-biased information!