Mainly to girls as they have smaller jaws but men can give their opinoon on the subject of course...
Do you have good blow job stamina? Does the size of the cock have a bearing on how long you can give head for? I.e. the thicker the cock the more your stamina is tested?

Do you have good blow job stamina? Does the size of the cock have a bearing on how long you can give head for? I.e. the thicker the cock the more your stamina is tested?