Insemination

In humans, semen is usually ejaculated into the posterior vaginal fornix in direct contact with cervical mucus,[6] though sperm may swim from other areas of the vagina or vulva to the cervix.

[4] Only a small proportion of the sperm in each ejaculation reach the site of fertilization in the fallopian tubes, their numbers decreasing exponentially as they progress through the female reproductive tract.

Advocates claim natural insemination generates higher pregnancy rates and a more 'natural' conception which does not involve the intervention and intrusion of third parties.

[12] In humans, artificial insemination may be used when a woman or her normal sex partner cannot, for any of a number of reasons, conceive by natural means.

It is painless and is the simplest, easiest and most common method of artificial insemination; it can be performed in the home, either by the female on herself or with non-professional assistance.

ICI involves the introduction of unwashed or raw semen into the vagina at the entrance to the cervix, usually by means of a needleless syringe.

[16] In some circumstances, sperm has been collected from males before they go off to war, or even right after they have died, and used to inseminate their female partners.

For example, in some species of hemiptera sperm can be introduced violently by traumatic insemination,[2] parenteral injection through the body wall.

In some species of animals, sperm finds its way through the body wall when the spermatophore is left in contact with the female's skin, such as in the onychophora (velvet worms).