The internet is kind of like a big, virtual Wild West, and much of what you come across has dubious value. There are way too many websites out there purporting to teach THE SECRET TO THE FEMALE ORGASM, or HOW TO MAKE A GIRL CUM IN THREE EASY STEPS -- all claiming that if you just follow said paint-by-numbers approach, you (or your partner) will cum your face off. Sadly, this isn't the case.
So, I decided to come up with my own points for clitoral play. These pointers are mainly for performing clitoral stimulation on a partner, but they work for solo sex as well.
1. Sorry, there is no secret formula. What floats my boat may not float Susie's down the street. There isn't one specific skill or technique that will work for every woman. Women are not cars; so, there are no manuals that will teach you Pussy 101 in three easy steps. You will have to get over your lock jaw and ask some pertinent questions. Such as "How would you like to be touched?" Be prepared to seek feedback. And women, you should be willing and able to provide it (i.e., do some hands-on exploration of your own terrain).
With that being said, the goal of clitoral stimulation should be about pleasuring your partner, not getting her off so you can feel like a stud or studette. Many women are not easily orgasmic when they are not in the driver's seat, which is one of the reasons that women climax more often from masturbation. Don't be offended if she needs to do her own stimulation or use a vibe.
2. Most of the time you will want to include some lubricant. In some cases, thanks to scintillating personal charm, good hands, or a talented tongue the woman in question may produce her own. But don't count on it. Particularly, if you are over forty. Use a good water based lube around the external genitals as a buffer for those 8,000 plus nerve endings.
3. Stimulating the clitoris does not mean touching the glans directly. Most women rub around the clitoris. I have never liked to have the clitoris touched directly. I find the most erotic spot is above the clitoris on the right side. Many women enjoy stimulating the shaft rather than the head of the clitoris. Check out 3D Vulva to understand the various parts of the clitoris. But to reiterate my point, there are women who do like direct clitoral stimulation -- once again, it's about asking.
4. I think learning to play the clitoris is like learning a musical instrument. It's about repetition and rhythm. While variety is the spice of life, you have to be able to repeat the same pattern with some variation. I think a lot of people either are too repetitive, or they vary the stimulation way too much. It is about finding a balance, and it involves asking questions about what is working and what isn't for that particular person.
So, stroke the perineum (the taint) and pull the vaginal lips. There's tons of nerve endings in the labia (which is sadly considered disposable window dressing by women seeking labiaplasty). Get creative, trying licking, taping, pulling, tugging, rubbing and vibrating. Odds on, she will find something that floats her boat.
6. I would never recommend any kind of vaginal or anal stimulation unless a woman has been aroused by clitoral play first. And then I wouldn't recommend stopping clitoral stimulation unless she has orgasmed. For many women, arousal will drop if the clitoris is taken out of the equation. So, that means that some form of clitoral stimulation should continue during intercourse -- unless she is vaginally orgasmic (only 30% of women are).
7. I think for many women developing an erotic fantasy life is necessary for orgasmic sex. Recently, I suggested to a friend who wasn't that familiar with erotica the classic Delta of Venus by Anais Nin. She is still thanking me weeks later. My friend is in her 60s, and she and her boyfriend (also in his 60s) had some extremely HOT sex. A very sexy read. Female friendly porn like Candida Royalle and Tony Comstock is also a good idea to learn what turns you on. If you are more conservative, you could try the old female standby the romance novel.