Our expert says:
Sorry, my watched broke and stopped a while back ! ( that's true !)
Seriously, there's no exact timing, as so much depends on the personalities, the nature of the relationship, and so on. I suppose its best to tell him, calmly, in a proper discussion ( not blurted out, out of the blue ) before he's likely to find it out himself, and surely before you two have unprotected sex, indeed preferably, before you have sex at all ?
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