Sims free play - slap a sim

I've just got a challenge to do which was 'slap a sim'. How do I do it? Also an I do it between a married couple?

You need two sims to become enemy or nemesis. It will unlock the 'slap' option

mines on nemeses and she won't slap the alien
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I have two sims that slapped each other but if won't complete te challenge

I have sims who are nemesis and enemies but it still won't unlock slap

that's true

With me it only worked at nemesis
between a new sim and an existing one.
Maby it is not posible between family
(Sims with the same familyname)
Also posible that your sims game has a bug
(Failure in the software)
In that case you can skip the challange
by using lp points.

I'm sick of using my lp to fix bugs in this game?

You don't have to use lp points. Just get two sims it absolutely deteste each other and this May work. Then it will unlock the slap option when there is a low relationship status. One of my sims once slapped a baby. Mi know and I didn't even tell it to do it. MIT it's walked right up to it and hit to rohnd the face! Hope my advice helps!!