Sounds like you just need more conditioning. Just keep practicing, work up your strength and endurance, and you'll be able to go on and on with your exercise routine! Good luck! *rereads FML* Wait, while masturb...oh, come on! Dude, no!!

Wow.. does this mean you would do the same through intercourse too? Just imagine someone started to have an asthma attack while you're in them or they're in you..