They take their pleasure according to their nature, and so it is necessry to fall in with their habits. If one Kisses contrary to custom and local sentiment, it is an amusement which no longer has any meaning and becomes distressing, like the air from a fan to someone who is cold. The people of Lata country (Gujarat) also lick the labia of the vagina, the crotch, the underside of the arms and the pubis.

from the Complete Kama Sutra

Not sure about this little exercise but I’m always glad to share some Kama Sutra with you, T4.