Anway getting back to Tantric and keigal . . . 
One of the ideas behind tantric and therefore also Keigal is to teach a man to delay ejaculation indefinitely.
ITs possible for men to have orgasms, even multiple orgasms without ejaculation.
As a reference point they use the fact that men can have orgasms before puberty from masturbation. Therfore they are having "dry" orgasms.
At that point men can have orgasm after orgasm without much of a refractory period.
Note for women: This means they can keep going as long as you can.
So the idea behind tantric is that the man can learn to have these types of orgasms again . . . and also as a side benefit they can last as long as they want to in bed.
Another side benefit is that men can derive more energy from orgasms and sex.
Women seem to gain strength and power from orgasms . . a few orgasms a day would probably make women more productive.
For men, ejaculation seems to drain their strength. So the tantric philosophy says that men that learn to have dry orgasms can not only last much longer, have multiple orgasms, but will derive the same kind of strength and power from sex that women do . . .
Also, the tantric system says that ejaculation is actually bad for a man and it gave a chart on how many times  a man should ejaculate a week determined by age!
 
But a man should have as many orgasms as possible . . just the dry variety.
Any more questions ladies?