Masturbating in front of a full-length mirror

For variety: Try masturbating while lying down or sitting in front of a full-length mirror (be sure to prop your head up so you can see yourself, if necessary). As you go, you'll see the changes in color as blood flow increases and decreases. You'll also see what your partner(s) sees, which can be useful later on ("Honey, see the fold of skin to the left?"). You know how it can be exciting to see a partner orgasm? It's not too bad watching yourself, either.  Add a toy to intensify the experience and enjoy.