Sexual Relationships 
Sexual Health 
Use Proper Spelling/Grammar and Avoid Abbreviations
You may be able to get away with that in casual conversation. Personally, I avoid it all together. However, when you are sexting, not only does it kill the mood to talk like this: "I want 2 suk ur dik" or "Show me ur bewbs pls," but it is also highly distracting and if used too much those of us that do not always text in that manner may have to do a double take in order to decipher it.
Set the Mood
Use trigger words to subconsciously set the mood. Even before you start you want to warm your partner up. Be clever and include words in your casual conversation such as, hot, wet, come, hard, deep, inside, just to name a few. Slip these words in seemingly innocent conversation to subconsciously get your partner in the mood. This is a concept made famous by pick-up artist Vin DiCarlo and I must say, it has worked to get me in the mood on more than one occasion, whether purposely or not. 
Start Slow and Suggestive
Send your partner something as simple as "I'm lying in bed, thinking about you." If you have set the mood correctly they will be able to decipher your intention. Hopefully, they are responsive. If not, you may have caught them at a bad time. No harm done. You have not made a fool of yourself because you have not taken it too far. Just try again another time.
Be Descriptive
When you text, your partner should be able to clearly imagine everything that you are doing. There are reasons why women read erotica. The authors use very descriptive, sensuous words. Make your partner see, hear, smell, taste and feel. When you actually engage in intercourse you use all of those senses. Do not make an exception when you are sexting. Make sure you vary your descriptive words. You do not want to be monotonous.
Be An Active Participant
The best sexting is when both parties are actively participating, otherwise you may as well just be masturbating. This does not necessarily mean that you both need to be engaged in a back and forth dialogue of what you are doing to each other. That can get a bit complicated through text, but it is possible if your timing is right. At the very least, be sure to communicate to your partner what you are doing to pleasure yourself and how what they are saying is making you feel. This will also aid them in setting a good pace in order to get you both off by the time it is all said and done.
Do Not Send Unsolicited Pictures
Not only could this get you or your partner in legal trouble, if it is seen by the wrong eyes, but it could be the fastest way shut-down your sexting game before it even begins. Notice how I said unsolicited. Meaning, if they ask for it, and you are both of legal age, by all means send away, but err on the side of caution. Do so knowing that if things backfire one picture could come back to haunt you.
Wrap Things Up and Leave Them Wanting
Do not abruptly end your sexting session. If done well, both of you will have gotten satisfaction from your interactions. Be sure of that before you move on. Tell your partner that you enjoyed yourself. Be appreciative of their time and effort. This should set the stage for your next interaction, be it in person or via text and leave you both wanting more.
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