This is the genetics: ( }3 i& N7 ~0 I! r* D/ t' E, t, h3 A# H: M% z
XY(man) x XX(woman) = 7 b0 E% w4 g2 y# }5 e2 j# X/ c
XX or XY, XX or XX, XY or XY. Some people have a twin. & {5 s9 k4 l0 g8 H X* l3 S6 O, q) [3 z# r* I- W& ?1 K9 ]
If you really need a boy, you can ask a doctor to take your Y only and injiect into your wife's XX, then you will have boy only. , q# {: Z1 L) S: H: F6 I1 K# O* G ( e/ E; K2 ?7 r1 n% b# j% z, OBecareful, eating drug may cause mutation although the possibility is not so high.
Autumn:你好!$ v7 u, P. r* o3 ?7 {5 z2 V
据我分析,生男生女取决于做爱时的姿势,体力,和之后的工作。理由如下:1。男精子活跃但不持久。就象运动员一样,男精子是短跑选手,女精子是长跑选手。如果作爱时男方插的较深,容易得男孩。因为男精子一冲则就。所以说姿势重要。具体啥姿势就自己参祥。2。同样道理,男方体力要保证。3。完事之后,女方不易短时站起。可增加受孕机会。4。算好时间,女性主宰性生活多为男孩,应在女性情期稍后,双方连续不断努力,则一蹴而就。0 r, W: M; Y) i
祝你如愿!成功告我一声。