Mr. bala1, I agree with AnnieBrooke, and BluCrystal, Hon! Sensuality, and intimacy are not about "organs"; they are in truth about building a strong, and mutually self-supportive relationship! If you are young, you might want to think about starting with respect, and friendship. Try not to pay attention to the pressures of what you see and hear in the media. I once fell in love with a lad because of his artistic ability!
Assuming you are "of age", if she feels you value her, she may very well join you in taking your relationship further. If she feels pressured, then I would not expect her to feel comfortable with sensuality nor intimacy with you. Bottom line, just treat her with respect and love, and you are on the right path!
bala, how old are you, and more important, how old is your girlfriend? If you (and especially she) are under the age of consent, you have no business expecting anything sexual, let alone insisting on it. Even if both of you are adults, maybe ad BluCrystal says, she finds your approach too demanding, or perhaps too crude. A woman likes to be appreciated and loved for her whole self, not just her vagina.
Sounds to me like your sexual behavior with her is a turn off for her. Best idea is to ask her what she likes and doesnt like, so you know what to do and not do.
Trolololo... And if not, look up the words: consent and coercion.
Idea 2 allow time and open discussion. Explore her ideas, perhaps she feels like a dog if she gets sniffed...