You can't "lock" something that doesn't exist.

[MagiusNecros]

Viera and Ronso in FF lore have distinguished genders. That's the problem people have. End of discussion.

[Crushnight]

Gender lock used in the way to be described as locked out from male Viera/female Hrothgar is wrong
Gender lock used in the way to be described as being locked in to female Viera/male Hrothgar is correct
what's the difference locked out implies there is another option there you just can't use it, locked in implies that is the only option and asking for removal in this case is asking for another option to be added.

See semantics is fun and the English language is so easy to know every meaning right :P