Very much such question interests here: speak, that it is necessary for conception of the girl and...

[Mignonette]

Very much such question interests here: speak, that for conception of the girl it is necessary to have affinity 2 3 days prior to an ovulation, for conception of the boy - in day of an ovulation. Whether means it, that if the affinity will be for 2 days and then in day of an ovulation the fertilization will occur or happen with spermotozoidom which has got later.

[The anonym]

- To mine it is full delirium. In fact the man passes you either X (girl) or Y (boy) a chromosome and at what here day of an ovulation?

[Ryazanov And.]

It at all delirium, really exist similar nauchno-the proved methods. Probability of success of 70 80 %. The spermatozoons carrying Y - a chromosome more mobile, but with a small stock of nutrients. They reach an ootid more quickly and at an occurring with her impregnate or fertilize it or her. But there live such spermatozoons about one day. The spermatozoons carrying X - a chromosome are less mobile, but with a greater or big stock of nutrients. They are capable to wait an output or exit of an ootid during 3 h and more than day.