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by  |  13-Mar-2016 11:38

As the sperm enter the human serum albumin, the differences in mass between the X and Y chromosomes manifest as the lighter male sperm push deeper into the protein than the females dragged down by the weight of the extra "leg" of the X sex chromosome.

This tiny difference creates separate layers of concentrated male and female sperm.

Both of them are based on actively rendering the second sex chromosome to be either a Y chromosome (resulting in a male), or an X chromosome (resulting in a female).

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Phim sex HD không che chịch bạn gái Sakai Momoka vú to trắng hồng lồn đẹp cực ngon, em sở hữu cặp vú to tròn trắng hồng, lồn đẹp như gái mới lớn vừa mất trinh, được bú liếm cái lồn non của em thật là phê Lén lút vụng trộm chị dâu xinh đẹp vú hồng dâm đãng, anh trai đi công tác xa nhà, ở nhà 1 mình với chị dâu, tôi đã không thể kiềm chế nổi dục vọng của mình.

Và chị dâu cũng thế, chị tôi có thân hình nóng bóng, cặp vú ...

The United Nations Population Fund states that “Local fertility restrictions and spontaneous rapid fertility decline below replacement levels tend to compel parents who want both a son and a small family size to resort to sex selection.” In many cultures, male offspring are desired in order to inherit property, carry on the family name and to provide support for parents in old age.

In countries such as India, China and Nepal sons have been favored over daughters.

- Random Fact: The average ejaculation is 1 teaspoon (which is about 5ml) Considering the amount of scenes on Videos Z, and let’s say there is 1 ejaculation per scene, we have over 300L of sperm (about 80 gallons) - and that’s not even counting the gangbangs!!!

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