Oral sex is the term given to genital stimulation by the mouth. It may be penetrative or non-penetrative, and may take place before, during, as, or following intercourse. It may also be performed simultaneously (for example, when one partner performs cunnilingus, while the other partner performs fellatio), or only one partner may perform upon the other; this creates a multitude of variations.
Fellatio is oral sex involving a man’s genitals. Possible positions include:
Cunnilingus is oral sex involving a woman’s genitals
Simultaneous oral sex between two people is called 69.

Some people like to give and some like to receive, but with the 69 position you can have the best of both worlds. This position is designed for mutual, simultaneous oral sex. It may be a little more difficult to concentrate on what you’re doing with your tongue when she’s busy at work between your legs, but the novelty of being pleasured while pleasuring her is one that is worth the effort.
When it comes to 69ing, there are some dos and don’ts.
TAKE A SHOWER
As with all sexual acts, especially those involving oral stimulation, it’s imperative to be clean and well groomed down below. Nobody wants to be greeted by unpleasant odours or a jungle of hair; this is bad 69 etiquette. So if you’re going to try out the 69 position, clean up and keep it trimmed. Better yet,jump in the shower so you can ensure you smell and taste fresh and clean.
INITIATE GRADUALLY
You should make a point of easing her into it, especially if it’s the first time you’ve 69ed with her. Don’t just get into position. She should take the hint from there.
DO NOT FORGET HER
When you’re trying out the 69 position, it’s important to not let the good feelings you are getting distract you from the ones you’re supposed to be giving. This is a mutual oral sex arrangement so it’s not fair if one of you starts concentrating too hard on receiving and neglects to perform as well. If this is a problem for you and you find your mouth constantly becoming lazy while hers is busy, you might be better off performing oral sex on each other separately, so your partner can have your full and undivided attention. This is common sense 69 etiquette.
STAY AWAY FROM HER BUM
This position may give you easy access to all her private parts, but it’s part of 69 etiquette to make sure she’s comfortable with it before you explore beyond her vagina. Some people find anal stimulation very pleasurable, but others find it horribly disgusting, so getting an idea of where she stands on the issue before you go anywhere near her bum is a good approach. If you don’t establish this beforehand, you may experience a very abrupt ending to your 69 session.
By following 69 etiquette, you can have a mutually satisfying oral sex experience and be a considerate gentleman at the same time, which greatly increases your chances of 69ing a second time. It is a truly unique sensation to be giving and receiving oral pleasure at the same time, and one that no one should miss out on.
Ask men.com