There are many books written about sexual relationships (and now I'm talking about novels) and sometimes they are called romantic novels but here are my 3 favourite "sexual" books - novels I adore to death, novels that show us there really is some difference between porn and eroticism since the latter involves love and true passion.
1. Lady Chatterley's Lover by D. H. Lawrence
Seriously, a list like this has to involve this novel. For your information, the book is about a married woman who starts a liaison with their gardener (how typical...) that happens to become something very serious. At its time, Lady Chatterley's Lover was rather a scandalous novel, something that everyone wanted to (or did) read but no-one was "brave" enough to confess it (remember that scene from Oscar when Stallone's daughter hides the book under her pillow so that her father wouldn't discover it) but somehow, just like many of its companions, it has become a must-read.
2. I Shall Spit on your Graves by Boris Vian
This one is so rare I couldn't even find the English cover, all I could come up with is the Hungarian edition. It was a year-long fight for me to get this book that is about an African-American man who looks like a "white man" and decides to take advantage of this while taking revenge on them for his brother's untimely death. And, what could be more mean than seducing rich white girl and then kill them brutally? Vian's novel is astonishing and brilliant.
3. The Dying Animal by Philip Roth
An elderly gentleman tells the story of his romance with a girl almost 40 years his junior - this time it is the man who suffers, who becomes dependant and despite all my adoration for the opposite sex, it's just great to see that men can live in pain for love as well. What I like about this novel is that it's the great example of the fact that no matter how old you are, love comes without respecting age gaps: it can arrive in the face of someone your age or someone much older/younger - all that matters is what you feel. It might seem romantic, but it's true. And this novel is simply perfect. Sometimes vulgar, other times describingly erotic but it's always, always about a man who - to use Bryan Adams's words - really loves a woman.