Because most gay men feel that they must
deny the existence of Bi-sexuality.
And the reality is that "sexually
" most humans are sexually attracted to both male and female -- it is more likely that that 20% (10% gay, 10% Strght) number is resereved for those who are only
sexually desiring of the same (homo-sexual) or opposite sex (hetro-sexual) with no room for the in-between.
and that 10% is inclusive of those who "tried
" straight-sex, because they felt society dicates that they must and realized --
"yuck, that ain't for me"
and those who were stoned outta their goard and slept their fag hag and woke up screaming and stating I"M GAY!!!!
...and having experienced the above doesn't make you straight it only helped prove you never were straight or bi.