Anonymous4: Like Loligagger said, they aren't cousins in the DCAU, their fathers (in this story) were not brothers. They didn't even come from the same planet.
Anonymous6: even if they are cousins. they fall under the adam and eve clause. being the last of their species, they have the right... no the duty to fuck over and over, trying to continue their blood line. and never mind the fact that they can breed with humans. it is just not as fun.
Anonymous7: Anon6 has a point. Hell, they actually pointed it out in the TV series: Clark refuses to bang high-school crush Lana because he's afraid he'll break her (and not in the good way). So when she gets powers they go at it like three days in a row, only stopping when the bed completely breaks down or something.
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On the other note, I like it
(geek alert)
yes they are. their fathers are brothers!