Is a boy more likely gay if he has multiple older brothers?

This is proven correct by scientists, who have discovered that if the woman has repeatedly had sons, her body becomes strengthened and used to the male hormones, being able to fight them easier. These impose more female hormones, and through some complicated, detailed process and such, as well as living conditions growing up for the child, it is proven that the more older brothers, the more likely the youngest is to be gay.

Also, if one of those brothers is gay, that skyrockets the chance of the youngest being gay.