you and your hand can go in 1 minute.
SEX IS ANOTHER THING!
dont think that you change positions in order to last long..... is the other way around. haha
you change, because you want, because is fun, because you enjoy different positions while having sex.
that could or could not help in lasting long.
but, by all mean, dont think that by changing positions you will last more. Why I make this point over and over, cause I think something important while your having sex, is NOT to be thinking in stuff like that. You need to relax, enjoy and make the other person enjoy! not more... good luck....
and masturbating and sex, are TWO different things.... both are soooo good lol.