Fact: Alcohol has been used pretty much since the advent of civilization as a drug to help get women to lose their inhibitions and screw less than desirable men. Just as the gun is the ultimate equalizer in a fight, alcohol is the ultimate equalizer when it comes to scoring with women.
Fact: Alcohol makes it harder for both men and women to cum and gives men erection problems. For women it does basically the same thing as the clitoris has more of a problem becoming fully engorged.
So, there you have it why a lot of women have to fake their orgasms and why very often a woman will have problems cuming in casual relationships where alcohol is almost always involved.
For example, my current GF I can get off on average anywhere from 5-10 orgasms easy on any given day but you get some liquor in her and I will be very lucky to get her to have even one orgasm which can be frustrating, but I prefer the honesty to lying so even though women may act sluttier and hornier when inebriated, unfortunately for them the actual sex is more often than not less than spectacular.
Anyways, assuming alcohol is not involved, some women are harder to get off than others. The hard to get off gals still have multiple orgasm potential once you get the first good one off, but that first one can be really stubborn in a lot of women.
What has always worked best for me is my fail safe move I call the "Triple Play" which is a combo of oral/digital play which unfortunately I doubt most guys can pull off in most women because they were not blessed with small hands like I have even though if you ask most women they prefer a guy with big hands to a guy like me with small hands.
Anyways, if your gal is not very tight, I suppose someone with large hands could do the same or else a variation using only one finger from each hand, but this is what I do.
First, start off with good old fasioned oral sex. Nothing too aggressive, just enough to warm her up. No need to explain any further because foreplay is different for everyone.
Once, she starts breathing somewhat heavily but slowly (if there is no reaction, either she is thinking about work she forgot to do back at the office or whether or not she remembered to slip the arsenic in your wine before dinner), take your index and middle finger and slide it in her in the position as you would for G-Spot stimulation. Basically, have one of your hands palms up with your index and middle finger inside her to stroke the roof of her vagina (the G-Spot area). Next take your other hand palms down and put your other index finger and middle finger in her with the backs of each hand up against each other so if you move your fingers you will be fluttering them like wings.
Now, the reason I call it the triple play is because all at the same time and in the same rhytHydromax (rhytHydromax is important in oral/digital combo work), you lick her clitoris, stroke her G-Spot with two fingers on one hand, and stroke her AFE zone while gently applying a little bit of pressure around her posterior fornix (area just below the cervix). Change up the stroking from back and forth with your tongue and fingers to side to side (think of it as trying to erase something on a chalkboard with her vaginal walls as the chalkboard) from time to time but make sure you keep everything in sync. Don't go too fast with this and as she gets closer to cumming, increase the pressure with your fingers and start sucking on her clitoris more aggressively (not faster, just with more pressure). When she is finally on the brink of orgasm, you decrease the pressure applied a bit but rub her with your tongue and fingers as fast as you can like a jack hammer. She will likely try and push your head away after cuming because of the intesity of the orgasm, but don't let her and instead keep doing it but slowly lessen up on the pressure because her clitoris and vagina will be very sensitive.
After you do this, take out the old Polish Sausage and if you have been doing Penis Enlargement long enough, hit the back of that fully retracted cervix AKA the CDS until either you or her is out of steam.
Anyways, this is just what I do. I don't do the triple play that often because you don't want to always be at your best in the bedroom or else that will become the new normal for her and by you spoiling her you will be shooting yourself in the foot because if you ever don't perform up to par, she will think something is wrong with you or else think she is getting bored with you when in reality you just spoiled her too much early on in the relationship.
I only pull out the triple play nowadays in desperate situations or special occasions. With my current gal, rarely is it necessary but I suppose in some women some guys would do anything just to get their gal to cum even 25% of the time.
Hope this helps (-: