If, he brings it up, then ask him to disclose first. That will put him on his heels and it should make him question the importance of the inquiry. If he insists, then tell him this: It seems that you are more interested in discussing my past that our future. I'm a grown woman and I have dated a number of people. Some relationships worked out, and others did not. The question that you should really be asking is whether I have any sexual history that you need to know about (current STD's).