To enhance your girls for the BJ Challenge, you can purchase with diamonds the Fellatio cards from the store, or from the free weekly Fellatio Deck.

To access the Decks area, all you have to do is go to the Girls tab and then tap/click on the deck icon from the right of the screen. You can only use cards on girls you have fully seduced.

Each card enhances a specific attribute or helps you decrease an attribute for the enemy team.

Below your inactive cards, there is also the option to go directly to the shop to buy more packs. Or you can also claim a free weekly pack.