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.

>>55
If a 13 year old and a 25 year old really were in love, the 25 year old would have no problem waiting until the 13 year old is 16 to make sure he/she doesn't hurt her/him
I agree, and I think this is currently probably mostly what happens, in these kind of cases. But really, why should they both be limited to wait until some arbitrary age (16 in your example) before they can have sex? I have heard of cases where the younger person (say 14yo) really wanted it, and even after the "adult" said they should wait, kept insisting. That person was dead set on it, and certainly didn't make some "hasty decision" and the older person has to keep showing restraint, just because society thinks what they're doing is "wrong"?

A sickening thought, preventing two people from loving each other.