It seems that finding strong religious convictions later on in life is a recurring theme within the Cameron household. Like her brother Kirk, Candace Cameron had no issue with filming kissing or love scenes when she was a little younger. Also like her brother Kirk, she's now heavily against the idea - although she hasn't quite gone as far as him with her reluctance to perform.
Cameron will still kiss co-stars if she absolutely has to, but has been vocal about never enjoying it, and will also resist any attempt to make her (or her character) film any scene which goes further than kissing. That makes her current line of work - in which she mostly appears in romantic films on the Hallmark channel - a strange choice. Part of the issue is that her husband feels so uncomfortable about her kissing other people that he won't watch any of her work.