FNV: Trait that make player learn Black Widow

[rixina09]

So I had this idea as I was making some character sheets, plus I thought, why not make the player put points into Charisma? Basically I would like to create a trait with the following:

TRAIT: Harlot
CONDITIONS: Charisma 8 | FEMALE PC
POSITIVE EFFECT: +15 Barter/Medicine/Speech. Black Widow Perk unlocked.
NEGATIVE EFFECT: -5 to Energy Weapons/Explosives/Guns/Melee Weapons/Unarmed.

Basically I could make this mod myself except for the part where Black Widow is bestowed on the player. If anyone has any know how, it would be appreciated.