I had a previous bf who's girth was close to 8 inches around, and while I could give him oral, it was reallyl unfomfortable and a serious challenge to get any amount of him in my mouth. Most of my blowjobs were more like me sucking on his head and jerking him off, which worked, but it was definately not an ideal situation for getting him off. I think that guy got more handjobs than any other guy in history though lol!