if your inexperienced, just fcuk ur gf more and explore each
other de body la..thats so simple...or if u wan a faster
way...watch more porn...most of my knowledge i got it by watching
porn....since pri 4...so kinda know most of the things...just that
experience not enough only.. 
either way, subscribe to some sex newsletter and find out more from
there then
cheers to a better fcuking life with ur gf ya...