Fill in the blank

I have a (a)_______.

The skin of my (a) is sensitive. Normally, when there is a trigger, my (a) will react differently and i will rub it subconciously. Today in class, it reacted differently. The environment triggered my (a) and it reacted in a way i felt awkward as i rubbed it. The situation kinda attracted some attention when i made cerain noise.. And i have got to lower the volume. Sometimes, for cleanliness and grooming purposes, i will trim the hair of it. This is an organ that is very important to me. Sometimes i really hope that i have a protruding (a).