me and my boyfriend are both 19, and I am his first partner. We have been together about 7 months now, and have been long distance for the past 5 months while I am at uni. when we were together the first two months he would finish very fast, and now its even faster when we get to see each other about two weekends out of a month. i am talking like within a minute in missionary and if its doggy then its within 3 thrusts. is there anything to do to make it last longer?