I never even thought about it when I was younger. We (a couple of friends got together once in a while just to JO). I couldn't even cum close now ! But what I did was got a long funnel from Auto Zone. Then get my legs up the wall as far as I can funnel in my mouth and let it rip. A tip is to lightly put some lube around the inside of the funnel--silicone seems best to me as I don't have to use much to make it slippery and not get much if any in my mouth when I cum. I like my own cum and some times my GF will help. Me upside down and her licking my balls makes for a fast hard cum. But she usually wants it in or on her ! Try it, you'll like it !