Foreplay & Oral

My SO wants to make me orgasm from oral since we're not doing penetrative sex yet but so far I haven't been able to orgasm from oral! Ive come close but he's got the idea it should happen in 10 minutes or less!! He feels like he's a failure if he can't make me orgasm!! He's more experienced with sex but for me he's my first!! Does foreplay before oral help with orgasm or is oral itself just a form of foreplay?? And what kind of foreplay gets ya'll off???