If you don´t have the opportunity to study from live nude models, the internet provides a great solution. Search for “nude models for artists”. It’s obviously not the same as far as spatial perception, but it is excellent to study proportions, masses, light and shade etc. of the human figure. It has never been so easy. I wonder what, for example Peter Paul Rubens would have said if he could have seen us studying this way! See also this post that I wrote about portraits models.