Problems with the cheating-system in relationships

[blackpanther52]

Hi guys, 

I hope somebody is able to help me out. 

 

Is there any way to set „having sex“ as main option (instead of „woohoo“ and „try baby“) for having sex? If I do have Sex (the option that comes with whickedwimms) with two different npcs and having a commited relationship with one of them i can not confess cheating to the partner. The game seems to think that „having sex“ is not cheating at all. 
Can someone help me out here? Is there a way to change the main sexual interaction from the original one to the one that comes with wickedwhimms?
 

Thank you in advance!