Nope, just read it and there's no mention of it. Of course, homosexuals can marry any member of the opposite sex with is above the age of consent, able to give legal consent, and is not a family member just like anyone else. Ergo, no discrimination (not that there's anything wrong with moral discrimination, mind you).
Precisely. That is why the 9th amendment exists. James Madison authored the 9th amendment to address the concerns of the anti-federalist that feared, rightly so, in the future, someone would make the case that if a right is not mentioned (enumerated) then it would not exist.
Just because a right is not mentioned in the Constitution, that a right is not listed or stated "shall not be construed to DENY OR DISPARAGE others (those rights) retained by the people."
For example, where do you think your right to consume the food of your choice and in the amount of your choice emanates from?
If the food Nazi's wish to deny your access to the food of your choice, what constitutional covenant are you going to stand on to protect that right?
By your reasoning, if it ain't mentioned, it doesn't exist, so there is no right to the food of your choice.
Where do you think your right to procreate the number of children you wish to have emanates from?
Where do you think your right to use the birth control method of your choice emanates from?
Where do you think the right to consume alcohol emanates from and why it took a constitutional amendment to deny or disparage that right during the 1920's?
Where do you think the right to home school your children emanates from?