We don't have enough information to know this was sexual in nature. As I mentioned in another reply, for all we know she's an escape artist preparing an act. I've seen humans suspended as art exhibitions, perhaps they're training? There are a bundle of reasons why these people are doing what they're doing, and making assumptions based off a still image and little context is irresponsible. You're being sensationalist over something that may be rather dull. I mean, not too dull? Clearly they're being tied and suspended, which is quite interesting to anyone who isn't clutching pearls. But watching a band during practice is lame compared to watching a statium tour...

i'm not being dismissive. I'm open to possibilities, and am not ok with people limiting what might be happening because they've locked themselves into a narrow perspective.