No idea here. There have been many a time when I have been someplace and someone starts talking to me and I have no idea who they are and this includes at times waking up to someone I have no idea the who's what's and where's of the person in my home or walking with me holding my hand and so on. This is no surprise to me cause it has been happening for I have no idea how long so I dont get upset by it I just ask so and so to leave or I have to be somewhere else and go on with my day. Im told this is sometimes normal with people like me who have Dissociative Identity Disorder. So to answer your question - I have no idea and Im kind of glad that I don't and somtimes on rare occasions wish I did.. But I know wishes won't make it so, so I take care of myself by getting all the STD testings and so on done regularly and so on.