Women ejaculation - it's not a myth. About 40% of women are capable of it, but don't allow it, because it feels unnatural at first (feels like you have to pee). Again, this is a result of the still undeveloped body being prepared for both sets of sex organs. The fluid is created in a series of glands between the urethra and vaginal canal. During an intense orgasm resulting from stimulating these glands (the g-spot), these glands contract, forcing a fluid strikingly similar to male semen (minus the sperm) into the urethra and out.
G-spot - as mentioned above, it's not a myth. The "g-spot" is actually a series of glands that are basically the female equivalent of the prostate in men. In an aroused woman, these glands swell. The largest and closest to the vaginal wall (about 2-3" in, on the navel side) can be felt and directly stimulated. As it is a gland, and not a collection of nerve endings (as is the clitoris), it responds to pressure, not motion.
g-spot stimulation - The best way to stimulate the g-spot is to have her lay on her back, with her knees up. This shortens the vaginal canal, making everything easier to get at. Insert two fingers, about 2-3 inches in. If she's properly aroused, with some feeling on the navel side of the vaginal wall, you'll feel a spongy area. This is the g-spot. PRESSURE-type stimulation....curl your fingers into a "come hither" kind of shape, and prod at the g-spot. not a tickleing motion, but a slow "come hither" type motion, with LOTS of pressure. another thing you can do is curl your fingers under her pubic bone, so they just barely hit the g-spot, and litterally lift her off the ground. Some girls like it, some don't, so be a careful lover.
Male "g-spot - The male "g-spot" is not a G-spot, but is similar. The male prostate gland is one large gland, usually the size of a golfball or a bit smaller. Immediately inside the anus, about 2 inches in, on the same side as the scrotum. Also responds to pressure, much like the female g-spot. An orgasm is possible from prostate stimulation alone, but very rare, and not terribly exciting.
Male orgasm - you all know it and love it. Simple and effective.
Male multiple orgasm - difficult yet worth it, and possible for every guy. It's largely a result of conditioning of your PC muscles through Kegal type excersizes. Masturbate, but the instant before orgasm, just as you begin to orgasm, stop ALL stimulation (let go, close your eyes, whatever) and sqeeze like you would if you were trying stop the flow of piss. After a while, you'll be able to orgasm without ejaculating, maintain an erection, and be ready to orgasm again within 10 seconds.....my record is 5 consecutive orgasms.
Female orgasm - comes in two kinds. Vaginal and clitoral. The clitoral kind is relatively easy to attain. Motion-type stimulation of the clitoris causes a shollow and explosive orgasm, usually short. Results (much like in men) a very sensative genital area for a few seconds. The Vaginal orgasm is much harder to attain. It's caused by PRESSURE-type stimulation of the g-spot. This orgasm is very different than a clitoral orgasm. Slow, dull and seemingly originating from deep within the body. Lasts and lingers for a long time. Most women who have had both kinds prefer the vaginal type, due it it's longer lasting and "warmer" type sensation. Many women who are unfamiliar with their bodies resist vaginal orgams, because they are somewhat associated with feelings that arn't usually associated with sex. From direct g-spot type stimulation, the initial feeling, lasting up to around 30 seconds, is that of needing to pee. As a result, most women resist, and never have a vaginal orgasm. Vaginal orgasms are also the kind that cause female ejaculation.
Female multiple orgasm - immediatly following orgasm, the genitals are sensative, but after a few seconds are ready to be stimulated again. 'nuff said.
A woman's wettness and it's limits - The only limit to the amount of fluid a woman can produce is the hydration and electrolytes in her body. The reason she's being "tapped out" is because she's no longer turned on. It's very likely that when she's no longer wet, she no longer wants to fuck. But, that's her call, some people like sex wether they are physically turned on or not. Ask her, give her the opportunity to stop, and if she wants to keep going, use lots of lube.