Not all. My past is my past, it happened before my husband and I were together. Unless it's something that can hurt him, like an STD, or a psychotic Ex, then there's really no reason to share everything unless you want to.

I am very honest with my husband, but he doesn't know everything, nor do I know everything about his past.

Why are you asking?

I would stay out of the past as much as possible.

I was a different person with an entirely different lifestyle.

Much would be misunderstood now.

Yes I usually do

I would not see any harm is sharing the past with someone. If they ask me I will be honest with them, I don't feel ashamed of my past.
I do expect the other person to be honest with me if they are very curious about my past, or want to find out more

I have no past to share. Neither does he.