its funny because i i have that issue on my left side with quads too... i always find a fucked up spot to hit there... its like i seek it out... i dont even try my left ventro at this point... my wife knows how to do it for me but i am one of those that just prefers to do it myself... if i fuck up, there's only one person to blame or get mad at but if she does it, then its a different story! =)