@mark93: if I read the top post right, they have the teen/adult attraction fix in for the first time now, *because* they don't want to use Inteen this time. To me, that implicates that previously, they *did* have Inteen, but *not* the T/A attraction fix.
IF my assumption is right, then your question would be irrelevant, because they're not asking about why their game borked previously. In stead, they're asking why the T/A attraction fix is causing problems now, *after* the reinstall, thus *without* Inteen.
@dxkg: ZZ is right. If the groups.cache file exists in your "My Documents/EA Games/The Sims 2" folder, then it will contain pointers to BHAV entry points in your mods and other custom files. After adding/deleting/altering any CC, those pointers are no longer valid, and the groups.cache needs to be deleted.
To be honest, I find the description for the T/A and skunk attraction fix a bit confusing. Because how could it be an NL-level mod, if it contains stuff concerning a skunk that doesn't appear until Pets? I'll dig around in the dead pool, see if there's a skunk-less version of that fix.
ETA: I got ninja'd by ZZ's attachment of an earlier T/A fix...