If you spread the pussy lips, you will find a small nodule at the top (12 O clock) When light yet firm pressure is applied, women will experience an orgasm. This pressure can be applied by the tongue or by the thumb. Women may find this orgasm "sharp", in contrast to the gspot orgasm and may not want to have further sexual contact.
It is your duty as a man to ignore women and continue working the nodule as well as the gspot ridge despite protests.