Don T, many of your list have survival value, e.g. pale and dark skin.
Albinism is a genetic defect, but there are genes that have no obvious survival value now.
The problem with a gay gene is that it is unlikely to be passed on at all
A gay gene would be lost from the pool unless the conditions I suggested apply.

(Being gay would then be a family trait and gay people would have more than average gay siblings and cousins.
This has not been observed.)