Akenaton

I do not believe that you are reading the statistics correctly.

2 million gay men

6,300 cases of aids in the UK in a year

70% of 6,300 is 4400 70% is your figure of the % of new cases which are Gay men.

2,000,000 / 4400 =

One case of aids per 450 gay men.

1/450 is not a majority.
You cannot use HIV infection rates which currently apply to one in 450 to infer the behavior of the whole "demographic" You are stereotyping. Lets put it down to bad math, but please, lets move on.