i have the same problem. i think its performance anxiety caused by fear of losing the hardness, but this doesnt really accomodate the first time. i seem to run into girls who like to recieve, but not give in return. sometimes i think im not used to being touched, so my body almost realizes that i dont need to sustain an erection if that makes any sense. i dont know of your experience and if this was helpful...you might be able to find more help if you post a thread similar to this in the ED section. goodluck