Assuming you don't have any particular reason to expect that this couple will be abusive, it's more ethical the better your genes are. If you have high IQ or other desirable heritable traits, great. (It seems plausible to anticipate that high IQ will become even more closely correlated with success in the future than it is now.) If you have mutations that might cause horrible genetic disorders, less great.
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.