I'm wondering what everyone thinks about explaining a person's sexual past. For almost all of my relationship I never told my girlfriend about my past until she found out about it on her own with no help from me constantly trying to cover it up. I was ashamed of what I have done in the past (I explain it in my other post: Changing from different types of relationships)

Some people suggest not bringing it up at all, and to be honest I never would have. Would there ever be a point where you would eventually expose your past? When would you have done it?