If you've had a few successful dates with someone, and believe you are now entering a relationship with them, it's probably OK to gradually start telling them sensitive personal information about yourself. It is likely that in a long-term relationship, there may come a stage where it would be expected to share personal information, so you will have to tell anyway. Your best bet is after a few dates because before then, the other person might come to the wrong conclusions about what kind of person you are and how you behave. For instance, some people may be anecdotally aware of someone with AS who was difficult to get along with, and by default associate you with them. On the other hand, with people you know well, whatever it is about AS that makes you "strange" or "different" (e.g. a tendency to lecture at length) will likely already be recognised by them anyway - so your telling them after a getting-to-know-each-other period just gives them a label to connect to the symptoms, rather than any substantive new information.