Going to an all boys school doesn't promote 'gayness', and doesn't always make it more acceptable to be gay. Sure, at Melbourne Boys (Thats where you go isnt it melbournian?) it may be, but it has more to do with the maturity, upbringing and open-mindedness of the school's population. If you were at a Catholic boys school, you wouldn't be accepted, or a School thats full of immature morons. It has more to do with the type of students rather than whether or not it's co-ed/single sex. I know of a fair few gays/bi's/lesbians, a few are openly gay, others keep it to themselves (others just reckon it's 'cool to be bi'....pfft) throughout the public/private/co-ed/single-sex system.
-- WR