i'm a sexxing n00b. i've only been sexxing (strictly) for ~ 2 months. i can't seem to get my pen0r up. for example, i do my missionary 5x5. whenever i get to my 5th thrust, if i could only do 3 the previous week, i STILL can only squeeze off 3. should i try moving ahead to a heavier grill or keep sexxing until i can finally get 5 off?