"Gratuitous nudity"
I wish people would learn the meaning of the word "gratuitous nudity". It means nudity that is not essential to the plot and is there for no other reason than pure titillation. There really isn't so much "gratuitous nudity" in mainstream movies as there is gratuitous sex scenes, gratuitous shower scenes, or gratuitous strip club scenes.
If you have, say, a shower scene (gratuitous or not) and you focus ONLY on actress' boobs and/or butt, THAT would be gratuitous nudity. But most Hollywood movies do the exact OPPOSITE of that if anything, yet they'll leave in the gratuitous shower scene but WITHOUT the gratuitous nudity. That's just stupid.
I take it in this movie there are a lot of sex scenes that are perfectly essential to the plot and Shailene Woodley doesn't wear all her underwear (or don a full-length burka) while doing them. This isn't "gratuitous nudity"; it's a realistic, adult sex scene. If Hollywood shot gun-battle scenes the way they normally shoot Hollywood sex scenes, all the participants would be carrying fluorescent squirt guns and yelling "bang bang", so thank god for "gratuitous nudity" in films like this.