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. Identical twins form when a single fertilised egg (ovum) splits in two. ...Having a twin brother appeared to lower the female score 43% of the way towards the male ... male and all the female same sex twins were taken as measuring the
...Siamese twins, congenitally united organisms that are complete or nearly ... identical twins, having the same sex and general characteristics. Siamese twins remain .
..Social factors may make gay men suicidal from Science News provided by Find Articles at BNET ... having at least one male sex partner after age 18 and the other reported having ...Having a sibling, especially a twin, impacts your life
. Your twin may be your best friend ... The penalty of having a sister -- why sibling sex matters for male saiga antelopes ...35 to 53. In each set of twins, one man had previously reported having at least one male sex. partner after age 18 and the other reported having sex only with females. ...