“What is hot?” Jack Morin, Ph.D, wrote the The Erotic Mind* back in 1995 and essentially answered that question. Eighteen years later, the book is still in print.
Dr. Morin did extensive research on the topic of sexual desire by collecting detailed written surveys about sexual excitement from hundreds of study subjects. His findings can be summarized by the following equation:
Attraction + Obstacles = Excitement
That sounds like the tired plotline of every Hollywood romantic comedy but also describes universal themes about what makes sex more exciting.
This basic equation can be elaborated by what Morin calls “The Four Cornerstones of Eroticism.”