Because our moment is so filled with tortures on the body, with stringing our puppet goo, experiments on flesh? Half of portraiture today looking like medical eviscerations (see: The violence against faces.) - our more genetically modified Picasso, not dismembering the ear/nose it but growing it there. So the lineage for these two - current figuration is medically experimental, grotesque, alien, et al - is here. But at some unconscious base is sexual violence, and the women who suffer at that. (It wasn't until Dan O'Bannon and Alien's brilliant reversal that the sexual violence threatened captains.) I like both Giger and Bellmer much, but acknowledge "the artworld [is] continuously electrified by depictions of women in societal bondage gear. Artists depicting the strictures that force women to conform to cultural mores; images of women made, if only momentarily, powerless or complicit ... that its success is simply a culture that likes seeing - culturally approved - women in bondage."
The Giger Chair trend, Amalia Ulman at The Gallery at El Centro, Cindy Sherman too, H.R. Giger on CAWD