INDIA
Often times, the left side of the nose is the most preferred side for piercing. According to Ayurveda, the left side of the women's nose corresponds with their reproductive organs. When the nose is pierced, it helps in reducing the pain during childbirth and may have some positive effects on conditions like endometriosis.
if you are a guy, you need to pierce your Right nostril. It is thought if the guy wears it in the LEFT nostril he is a gay and girls wearing it on the RIGHT nostril are lesbians according to western culture.
But, seriously, wear it where you want left or right. It is your priority and comfort that matters.
WESTERN
At common times, the left side of the nose is the one who will attend the pierce. By cognitive reasons, people will always choose to accommodate their left side of the nose with the piece of body art. This outside part of the nose is used in the India for piercing. The practice will take you to an easier hold of the childbirth. People will also share these ideas also because of the Ayurvedic medicine that associates the left side of the nose with the female productive organs. When that part of the nose is pierced, it helps in reducing the pain during childbirth.
The right side of the noise is commonly associated within the female structure, or so they say. It is thought by western culture that if the guy wears it in the right side he is gay and the girl who wears it on the left is lesbian. But please don’t take this serious, wear it where you think it suits your appearance due to that what really matters is your comfort.



source - internet