1)Do you know how many guys your wife or girlfriend has slept with prior to meeting you?
Pretty sure. If anything I don't know about, it was non-consensual.
2)If so, what is the number?
2. Sometimes she pretends it's 1, I think because it was lousy, but I don't care how many.
3) Do you think she is telling you the truth?
Yes.
4)Does the number of guys she slept with matter to you?
No.
I've been with virgins and with sl*ts, and like Woody Allen says - even the worst orgasm was right on the money.
She's entitled to the same.
5) Do you ever discuss her past sex life with her? I.e. cock size she has had, etc.?
Not really. She's pretty emphatic that I'm the biggest.

I've told more than she has. She can tell me whatever she wants to, and I tell her whatever she wants to know. She's definitely curious about my exes at times.