- Skip the euphemisms. Show your reader some respect. If you need some awful examples to avoid read 50 Shades (Down there? Really? What are we, eleven?)
- Make it consensual. Obviously consensual. Non-consensual sex is not erotic or sexy. At all. It is just wrong.
- Your characters are not porn stars. Unless they are porn stars. It needs to be hot, but not unbelievable. Don’t use clichés from terrible porn movies.
- Stay true to your characters. As with all action scenes and as with all dialogue, your characters need to behave and speak in a way your reader can believe they would behave and speak.
- Make sure the scene has a purpose. Like any scene or event in your book it needs to drive the story forward.
- As with all your writing, but especially when writing about sex, use all five senses. ALL of them.
- Often the idea of sex is more erotic than the act itself. Build up the tension.
- Act it out! Seriously – one of my best teachers on my Masters course had written both excellent fight scenes and excellent sex scenes and she insisted that the best way to make both realistic and readable was to act them out. (That way you don’t end up having your characters do things that would take three hands each and I don’t have to sit there on a Tuesday afternoon wondering what’s supposed to be going where when I’d rather be eating a biscuit).
Once again, my top tip is to read. Shirley Conran and Jilly Cooper write better sex scenes than a certain other author mentioned above as does Sylvia Day (sometimes). And of course you can’t beat a bit of D H Lawrence. Though in my humble opinion Flaubert did it best with poor old Madame Bovary.