Read these free ebooks on the female orgasm (they come with diagrams and instructional videos with a rubber vagina):
A spot orgasm
C spot orgasm
G spot orgasm
Then DO it. If you don't, you'll be jealous in every relationship you're in and drive girls away. Less than 5% of guys are good in bed and 75% of girls cheat because their boyfriends/husbands are bad in bed.