According to various instagram "spats", Portia kissed Luke, Thomas, Nathanial and Paul.
There was apparently no issue with those husbands kissing her back as their wives were there, they had set their boundaries and everyone was kissing each other. Portia had come to the party alone, leaving Terrence not knowing where she was or what she was doing. That's why the other husbands (Luke and Georgessss!) stirred the pot about her behaviour.
(Disclaimer: I wasn't there, just read too much gossipy crap).