Morality is about right and wrong. I don't believe that there is such a thing as "higher" or "lower" morality, there is only one's capacity to split hairs over what is "right" versus what is "wrong" as agreed upon and documented by the majority over time.
No matter what the legal age of consent is, you must first ask if the 15 year old has the capacity to make decisions about what is "right" versus what is "wrong".
Oddly enough most societies would say she does not have that capacity (voting, ability to enter into contract, et-al) but would say she can consent to sex. Thus my working hypothesis is that dirty old men make laws and it is not right to have sex with an individual that can't even vote.
Keep Up with TechRepublic