I think it would bother me more if my sons experimented with girls than with boys
That is very odd. Why do you think it would bother you more if they experiment with girls than boys?
Boys just experiment better with their own, and girls do not really experiment. It's just their nature.
Everyone has their own path to follow. You shouldn't demand they go anywhere they're not naturally inclined to go.
My taste is different, no kind of problem exist for me to have a problem with my sons liking other boys.
Well, you have established that your taste is different, but so as your sons. They can be interested with whoever they like and you should accept them from who they are and not restrict them from loving who they want to love.