The nipples are an erogenous zone for many people and stimulating them with your mouth can be very arousing.
For both men and women, the nipples can be an erogenous zone that can provide an intense feeling of pleasure and arousal when stimulated. This can be by touching, kissing, licking or sucking on them. Some people can even achieve orgasm just by having their nipples stimulated. Try starting by gently blowing on your nipples.
It's not just physical stimulation that can be arousing, but also the mental and emotional connection to the nipples. Some people can feel more intimate and connected to their partner when they have their nipples stimulated.