A guy I was with recently asked "Where are all those marks on your legs from", I just said "They're from a long time ago" and that was that. You don't have to go into any details if you don't want to. I think it's probably fairly obvious how you got your scars so any guy who asks about them is probably just curious or is checkig if you want to talk about it.
Thats a really tricky one about future children
I'd ever thought of that before!