Which sexual "immorality" is worse?

-Consentual sex between parent and off-spring (any age)? 
-Consentual sex between siblings? 
-Consentual sex between cousins?
-Consentual sex between pre-adult/teen and pre-adult/teen? 
-Consentual sex between pre-teen and pre-teen? 
-Consentual sex between pre-adult/teen and pre-teen?
-Consentual sex between an adult (other than parent/grandparent/etc.) and pre-adult/teen? (Assume the pre-adult/teen understands sex and does consent--legality is not the issue here)
-Consentual sex between an adult (other than parent/grandparent/etc.) and a pre-teen? (Assume the pre-teen understands sex and does consent--legality is not the issue here)
-Consentual sex between an adult and an adult who are un-wed?

Again, legal ramifications are not at issue, only your own personal "morality" towards these specific pairings.

Actually consentual sex between cousins is even legal in the US, assuming they are distant enough in relation.  but when does a relative become distant enough it is legal to fuck them.  cousins are probably distant enough to avoid any birth defects. 
    the problem is that there are recessive defective genes spread evenly across the human population, and we all have them.   the reason we don't all have defects from this is because being recessive they require the person have a matching set of them in order for the a serious defect to occur.  minor defects in people happen all the time, however serious ones require more genes and are much less likely to occur.  However a relative is more likely to have the same defective gene as me than another random person from the population, being that a relative and i share a source for our genetic material.  my sister and i have a 1/4 chance of sharing any one particular defective gene.  assuming we have a child the chance of it having a pair of any one of these recessive genes is 1/16(1/4 for my sister and i having the gene, 1/4 for both of us passing it on to the child).  and this is just one gene, we are likely to share several.  cousins are much furher apart genetically.  assuming my father's, sisters, daughter and i have a child the chances that we would pass any specific pair of shared recessive genes can be found with the following.  first assuming i automattically have the gene, it's 1/2 that i got it from my father, and then 1/4 that he shares the gene with his sister(assuming same parents in all cases), then 1/2 that the sister passed it to the daughter, making the chances. so 1/16.  or aproximately 1/4 that of having a kid with my sister.  and the more distant the less the chances are, and with distance the chances of it decrease exponentially.  at what point it becomes the practically the same as not being related at all is about 3rd or 4th cousins.