No "not serious" things that she admits to.. and yeah, 5 serious relationships before 22 does seem a little sus. I don't blame you for wanting to think about it. If you're looking for marriage and kids, then I'd definitely pass if I were you.I actually saw her this evening as she had unexpected free time, and I asked her. I think she answered honestly. She said she has had 5 serious relationships before (she's 22-23) and no "not serious" things. I told her that it seems a bit much, and that I needed to think about it.
To be frank, this is kind of a bummer. 5 partners by 22 is quite a lot IMO, but given the state of women I'm not sure if it is reasonable to reject her on that basis alone.