Blow Jobs.

The only time i willingly want to give my SO a blowjob is when im super turned on. Other then that im not crazy about them, but i'll do it to satisfy him. I just don't know why i feel so weird about it. Like im not comfortable with it; but anything else im so comfortable. But sometimes sex makes me feel weird too. But with my SO it feels completely normal. Idk how to be comfortable with giving head