Jim's theory that "sex without feelings is either violence or exercise" is a variation on Shawn's line from 'Body Shots': "Sex without love equals violence"
A character in this film mentions that he enjoys using ice during sex, and briefly mentions a film in which ice is used during sex, however he cannot remember the title, it is 9 1/2 Weeks, as Mickey Rourke's character uses ice during sex with Kim Basinger