I found that I am actually unable to cum during BJ regardless of how long it is... in fact if it goes too long, I get bored and golimp and after that I find it difficult to get it up again.
But in missionary I dun think I can last more than 4 mins
and if the girl is really into it and enjoying... I might not even last more than 2 mins which in most cases I feel really embarrassed. I would like to let my partner enjoy as much as me.
Sometimes I wonder if I jerk off too much when I was younger watching porn. Always wanting to get it over asap so that my mother will not catch me. Maybe that is why I cannot control which I wish I can.
Only once I managed to go on for about 40 mins. Thats only because I was going to cum and my partner yelled out NO!!! and she started rubbing her clitoris faster so that she can cum before me. I was embarrassed and shocked and the end result was I was still hard but desensitized and I pumped her until she came 3 more times before I could cum lol