PCB82 Install NRaas Retuner if you don't already have it. Click City Hall or an in-game computer and select NRaas > Retuner > Show Object Menu (to set it to True). Click a slot machine and select NRaas > Retuner > [name of interaction] > Allow Age Species > Human Teen (to switch from False to True).
You may need to try a couple different interactions before you find the one that unlocks the object for teens. For example, with the Martial Arts board breaker, Practice is already set to True for pregnant sims, but my current pregnant sim can't use it unless I set Practice \ Foam Board to True for pregnant sims as well; that unlocks using all types of boards.
As a side note, teen sims cannot get married or pregnant without a mod. That's always been the case, in this game and Sims 4 and probably Sims 2 as well. Drinking "nectar" is different since it's not supposed to be alcohol and doesn't have intoxicating effects.