It's all about DETAILS. Write a whole paragraph or two about each of those points that you want to include. Use all of your senses to describe everything you remember about being with her sexually... and of course, it's very helpful to include how she makes you feel inside (emotionally), as for many women there's no line between emotional/mental/sexual stimulation.
My quiet bf went out on a limb last summer and wrote me the hottest erotic e-mail when we were apart for a couple of weeks... it was all about what he intended to do to me the next time he saw me, from first kisses to orgasm and beyond. It was fantastic. I printed it out and stuck it in my journal, to read and drool on from time to time.
If you're lucky, OneSnowyOwl will make an appearance and drop a sample line or two... she's pretty amazing with the erotic writing.