What does love is a crocodile along the river of desire mean?

According to the book "Legislative Theatre" by Augusto Boal, the phrase is from a first century AD Sanskrit writing. It is also called a Sanskrit proverb by a few internet sources. You can find them by searching for "in the river of desire" or "on the river of desire", instead of "along the river of desire". According to Augusto Boal, the "river of desire" is a necessary part of human existence, and "love" is a dangerous part of that.