There's another problem with this scale -- which I think is an actual problem, unlike the one taw complained about. The name of the scale suggests it's meant to measure attitudes but 1 and 2 also measure opportunity. Someone might be very open in principle to sex without love or commitment, but find that no one (or no one they find sufficiently appealing) wants to have sex with them.

(Of course it is possible to buy sex for money, but there are reasons why someone might not want to do that that have nothing to do with "sociosexual openness".)