2 thumbs up to janissa10,
What is important is being here and now. The need to know about past relationships is grade school stuff man. That trip is based on being insecure within the self, having nothing to do with the other person. Except, of course (as janissa101 said), when std's are involved. That is a different matter entirely, and in that case, it is a matter of the dis-ease itself and not necessarily how it was obtained.
With Regards,
Daniel