When I hear the word kirk, I think of a church, which of course includes the whole sex before marriage thing. So seeing Kirk chasing after everything in a skirt always amused me.
As for Hernandez, make her totally asexual. Married to her job, without any interest in a romantic or physical relationship with anyone (male or female). I could imagine someone growing up in a place where 'rape gangs' roamed the streets would cause intimacy issues.