Is sex with ur step-sister ok?

Just to start its not me, i dont have this siutation. My friend told me that he's been sneaking around having with his step sister. I knew his dad got remarried about 5 months ago, so im assuming this has been going on since that time. He told me that he's begining to feel bad about it, and im just disgusted by what he's been doing, I know they aren't blood related but still, its ur fucken step SISTER!! anyways is that ok, to be having sex with ur step siblings?
yes its ok
no its wrong
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Is sex with ur step-sister ok?
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