And why is the good sexual chemistry/connection something to count against a future partner?

TRP claims about the life long loyalty of virgins, or the lack of loyalty and respect among more experienced women, sound more like they were frequently cited by junior high locker rooms, rather than any peer reviewed scientific journals. After all, a virgin can become a shallow thrill junkie too. And an experienced woman may be better suited to understand and appreciate what her partner is bringing to the table.