There's certainly something odd, and IMHO, ugly about those B&W skin tones. The nude on the beach, for example, has hardly any separation between skin tone and sand, sea, or sky. I suspect that the originals were all shot in colour, and B&W prints made from colour neg or from scans.(posted 8145 days ago)
Alternatively, a heavy body tan or make-up may have been applied to the models. In any case, it's not a look I feel a desperate urge to emulate.