For there to be spontaneous pregnancy, the first condition is that the couple of sexual intercourse, and the second with vaginal. If he enjoys it, it will be even better because the female orgasm helps the sperm to penetrate more easily the barrier of cervical mucus : spasmodic contractions of the lower abdomen have the effect of a suction pump on sperm.
The position has adopted a very relative importance, As ejaculation does occur in the body of the woman, the sperm can enter the uterus and back to the egg. At most, Some positions will offset the gravity and leave a little more time before the reflux eject the last stragglers ...
The positions where the woman is horizontal and deep penetration can be in this class of positions facilitative :
You can find on the net illustrations and detailed explanations :
- on Wikipedia
- on "pregnant" one full article on the subject, and Fertility the information site of Serono further explanations,
- Kama Sutra in the picture with explanations,
- and even sculptures.
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