Its all about equality in love and commitment, so why discriminate against sibling incest.
I don't agree with it by the way, however I am positing the equivalent argument as to what the gays have done.
Homosexuality was once illegal, now its kosher (Halal?)
Sibling incest could use exactly the same rationale.
The only transparent argument against it has been and is, that birth defects are increased dramatically.
If that rationale is taken out, (via obligatory pre-marital sterilization), what's the big no-no about it other than the biblical condemnation which the world seems to have comfortably jettisoned in the Gay mantra.
