[YetAnotherMatt]

None of them are religious.

Negative selection bias as in people who are less capable to maintain long term relationships are more likely to have a lot of dating history.

Conversely, people who are super easy going and great partners to be with may have very few people break up with them (and kind of succeed on the first try).

Or another way to put it: To have a long dating history with a lot of different partners, you need to have broken up (or been broken up with) quite a few times. This could be due to circumstances outside of your control, but that is probably not true for all people in that category.