If it's a small problem, like my boyfriend is veering a little to the left or right, I'll try to just move my body to position them differently. If something isn't feeling right, I'll say something. My body is very specific about what feels good when. If you don't do something at the right time, it isn't going to work, so I tend to give a lot of directions.
How do you handle the situation when you are receiving oral sex but the giver isn't doing it just right for you?
I feel like it is always a good idea and extremely healthy to voice your opinion when it comes to sex or your partner will never understand and you will lead a relationship where you look forward to alone time with toys more than you do your partner.